82-beta

Note
 - this is not the same as 2517 which disables the API
 - RFP does not determine what is supported or not supported: so that entropy remains
 - with or without RFP, if the media config is not supported it returns false,false (so there is nothing to spoof here)

.gitattributes

@@ -0,0 +1,16 @@
+* text=auto
+
+*.js text
+*.md text
+*.yml text
+*.txt text
+*.sh text
+## *.bat text eol=crlf
+*.bat -text
+
+*.png binary
+
+.gitattributes export-ignore
+*.yml export-ignore
+/wikipiki export-ignore
+/.github export-ignore

.github/ISSUE_TEMPLATE/tools.md

@@ -0,0 +1,18 @@
+---
+name: Tools
+about: Report issues with the updaters, the troubleshooter, or any other tools.
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+<!-- 
+Please specify: 
+  - the name of the file (i.e. updater.bat, updater.sh)
+  - steps to reproduce the issue
+  - actual result
+  - expected result
+  
+Blank out this field before typing, or start typing after the next line.
+-->

.github/ISSUE_TEMPLATE/troubleshooting-help.md

@@ -0,0 +1,28 @@
+---
+name: Troubleshooting help
+about: Ask for help to solve problems with user.js
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+Before you proceed...
+  - Issues will be closed as invalid if you do not [troubleshoot](https://github.com/arkenfox/user.js/wiki/1.4-Troubleshooting), including
+     - confirming the problem is caused by the `user.js`
+     - searching the `[Setup` tags in the `user.js`
+  - Search the GitHub repository. The information you need is most likely here already.
+  - Note: We do not support forks
+
+See also:
+  - Extension breakage due to prefs [issue 391](https://github.com/arkenfox/user.js/issues/391)
+  - Prefs vs Recommended Extensions: Co-Existance+Enhancement | Conflicts [issue 350](https://github.com/arkenfox/user.js/issues/350)
+
+If you still need help, help us help you by providing relevant information:
+  - browser version
+  - Steps to Reproduce (STR)
+  - actual result
+  - expected result
+  - anything else you deem worth mentioning
+
+Clear all of this when you're ready to type.

.github/ISSUE_TEMPLATE/user-js.md

@@ -0,0 +1,15 @@
+---
+name: user.js
+about: Suggest changes to user.js
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+We value feedback in general, but we value feedback from informed users more. There is no need for you to be an expert to participate (most of us aren't), but we hope that you at least understand our decisions before questioning them. We discuss all changes openly, and we do not make changes lightly. So, if you don't understand why we decided to add/remove/change a certain pref, search the repo. The answer is most certainly here.
+
+If some change we made took you by surprise (in the wrong way), remember that keeping track of changes is your responsibility. Watch the repo, read the [changelogs](https://github.com/arkenfox/user.js/issues?utf8=✓&q=is%3Aissue+label%3Achangelog), compare [releases](https://github.com/arkenfox/user.js/releases) as you update your copy of user.js, or use any other method you prefer.
+
+Clear all of this when you're ready to type.
+

LICENSE.txt

@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (c) 2017 ghacksuserjs
+Copyright (c) 2020 arkenfox
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

README.md

@@ -1,35 +1,27 @@
-### ![](https://github.com/ghacksuserjs/ghacks-user.js/blob/master/wikipiki/bullet01.png) user.js
-A `user.js` is a configuration file that can control hundreds of Firefox settings. For a more technical breakdown and explanation, you can read more on the [overview](https://github.com/ghacksuserjs/ghacks-user.js/wiki/1.1-Overview) wiki page.
+### 🟪  user.js
+A `user.js` is a configuration file that can control hundreds of Firefox settings. For a more technical breakdown and explanation, you can read more on the [overview](https://github.com/arkenfox/user.js/wiki/1.1-Overview) wiki page.
 
-### ![](https://github.com/ghacksuserjs/ghacks-user.js/blob/master/wikipiki/bullet01.png) ghacks user.js
-The [ghacks user.js](https://github.com/ghacksuserjs/ghacks-user.js/blob/master/user.js) is a template, which, as provided, aims (with [add-ons](https://github.com/ghacksuserjs/ghacks-user.js/wiki/Appendix-B:-Firefox-Add-ons)) to provide as much privacy and enhanced security as possible, and to reduce tracking and fingerprinting as much as possible - while minimizing any loss of functionality and breakage (but it will happen).
+### 🟩  the arkenfox user.js
 
-We aim to INFORM and give you CHOICES. No one size fits all, so customize it! And not all sites have the same requirements, so use [profiles](https://github.com/ghacksuserjs/ghacks-user.js/wiki/2.3-Concurrent-Profiles) with custom versions. We won't set you wrong.
+[![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)
 
-INFORMATION IS POWER. So you can make informed decisions to better protect yourself online, we aim to be:
+The `arkenfox user.js` is a **template** which aims to provide as much privacy and enhanced security as possible, and to reduce tracking and fingerprinting as much as possible - while minimizing any loss of functionality and breakage (but it will happen).
 
-* Accessible (provide information and simpler, less-technical descriptions if possible)
-* Accountable (provide reputable references/sources, [test sites](https://github.com/ghacksuserjs/ghacks-user.js/wiki/Appendix-C:-Test-Sites), dispel bad advice)
-* Change trackable (yay! we're on github now, with commits)
-* Compatible (including a deprecated section, [releases](https://github.com/ghacksuserjs/ghacks-user.js/releases))
-* Comprehensive (including enforcing defaults and future-proofing)
-* Current and up-to-date with stable (including [changelogs](https://github.com/ghacksuserjs/ghacks-user.js/search?q=label%3Achangelog&type=Issues&utf8=%E2%9C%93))
-* Detailed (preference versioning, hidden preference information, explanations, and more)
-* Easy to use and discuss (sections, sub-sections, numbering)
-* Helpful (including a [wiki](https://github.com/ghacksuserjs/ghacks-user.js/wiki) with features such as [add-ons](https://github.com/ghacksuserjs/ghacks-user.js/wiki/Appendix-B:-Firefox-Add-ons), [user scripts](https://github.com/ghacksuserjs/ghacks-user.js/wiki/3.1-User-Scripts), [references](https://github.com/ghacksuserjs/ghacks-user.js/wiki/Appendix-D:-References) and more)
-* Innovative (formatting, special tags, and future plans such as branches)
+Everyone, experts included, should at least read the [implementation](https://github.com/arkenfox/user.js/wiki/1.3-Implementation) wiki page, as it contains important information regarding a few `user.js` settings.
 
-### ![](https://github.com/ghacksuserjs/ghacks-user.js/blob/master/wikipiki/bullet01.png) usage
-Everyone, experts included, should at least read the [implementation](https://github.com/ghacksuserjs/ghacks-user.js/wiki/1.3-Implementation) wiki page, as it contains important information regarding a few default settings we use. The rest of the [wiki](https://github.com/ghacksuserjs/ghacks-user.js/wiki) is helpful as well.
+Note that we do *not* recommend connecting over Tor on Firefox. Use the [Tor Browser](https://www.torproject.org/projects/torbrowser.html.en) if your [threat model](https://www.torproject.org/about/torusers.html.en) calls for it, or for accessing hidden services. 
 
-### ![](https://github.com/ghacksuserjs/ghacks-user.js/blob/master/wikipiki/bullet01.png) acknowledgments
-Literally thousands of sources, references and suggestions. That said...
+Also be aware that the `arkenfox user.js` is made specifically for desktop Firefox. Using it as-is in other Gecko-based browsers can be counterproductive, especially in the Tor Browser.
+
+### 🟧  sitemap
+
+ - [Releases](https://github.com/arkenfox/user.js/releases)
+ - [changelogs](https://github.com/arkenfox/user.js/issues?utf8=%E2%9C%93&q=is%3Aissue+label%3Achangelog)
+ - [Wiki](https://github.com/arkenfox/user.js/wiki)
+ - [stickies](https://github.com/arkenfox/user.js/issues?q=is%3Aissue+is%3Aopen+label%3A%22sticky+topic%22)
+ - [diffs](https://github.com/arkenfox/user.js/issues?q=is%3Aissue+label%3Adiffs)
+
+### 🟥  acknowledgments
+Literally thousands of sources, references and suggestions. Many thanks, and much appreciated.
 
-* Martin Brinkmann at [ghacks](https://www.ghacks.net/) <sup>1</sup>
-   * 100% genuine super-nice all-round good guy
-* The ghacks community and commentators
-   * Special mentions to [earthlng](https://github.com/earthlng), Tom Hawack, Just me, Conker, Rockin’ Jerry, Ainatar, Parker Lewis
-* [12bytes](http://12bytes.org/articles/tech/firefoxgecko-configuration-guide-for-privacy-and-performance-buffs)
-   * The 12bytes article now uses this user.js and supplements it with an additonal JS hosted right [here](https://github.com/atomGit/Firefox-user.js) at github
 
-<sup>1</sup> The ghacks user.js was an independent project by [Thorin-Oakenpants](https://github.com/Thorin-Oakenpants) started in early 2015 and was [first published](https://www.ghacks.net/2015/08/18/a-comprehensive-list-of-firefox-privacy-and-security-settings/) at ghacks in August 2015. It was kept up-to-date and expanded by the original author with three major updates and articles. With Martin Brinkmann's blessing, it will keep the ghacks name.

_config.yml

@@ -1 +1,3 @@
 theme: jekyll-theme-midnight
+title: user.js
+description: An ongoing comprehensive user.js template for configuring and hardening Firefox privacy, security and anti-fingerprinting

prefsCleaner.bat

@@ -0,0 +1,110 @@
+@ECHO OFF & SETLOCAL DisableDelayedExpansion
+TITLE prefs.js cleaner
+
+REM ### prefs.js cleaner for Windows
+REM ## author: @claustromaniac
+REM ## version: 2.3
+
+CD /D "%~dp0"
+
+:begin
+ECHO:
+ECHO:
+ECHO                 ########################################
+ECHO                 ####  prefs.js cleaner for Windows  ####
+ECHO                 ####        by claustromaniac       ####
+ECHO                 ####              v2.3              ####
+ECHO                 ########################################
+ECHO:
+CALL :message "This script should be run from your Firefox profile directory."
+ECHO   It will remove any entries from prefs.js that also exist in user.js.
+CALL :message "This will allow inactive preferences to be reset to their default values."
+ECHO   This Firefox profile shouldn't be in use during the process.
+CALL :message ""
+TIMEOUT 1 /nobreak >nul
+CHOICE /C SHE /N /M "Start [S] Help [H] Exit [E]"
+CLS
+IF ERRORLEVEL 3 (EXIT /B)
+IF ERRORLEVEL 2 (GOTO :showhelp)
+IF NOT EXIST "user.js" (CALL :abort "user.js not found in the current directory." 30)
+IF NOT EXIST "prefs.js" (CALL :abort "prefs.js not found in the current directory." 30)
+CALL :FFcheck
+CALL :message "Backing up prefs.js..."
+SET "_time=%time: =0%"
+COPY /B /V /Y prefs.js "prefs-backup-%date:/=-%_%_time::=.%.js"
+CALL :message "Cleaning prefs.js..."
+CALL :cleanup
+CALL :message "All done!"
+TIMEOUT 5 >nul
+ENDLOCAL
+EXIT /B
+
+REM ########## Abort Function ###########
+:abort
+CALL :message %1
+TIMEOUT %~2 >nul
+EXIT
+REM ########## Message Function #########
+:message
+ECHO:
+ECHO:  %~1
+ECHO:
+GOTO :EOF
+REM ####### Firefox Check Function ######
+:FFcheck
+TASKLIST /FI "IMAGENAME eq firefox.exe" 2>NUL | FIND /I /N "firefox.exe">NUL
+IF NOT ERRORLEVEL 1 (
+	CLS
+	CALL :message "Firefox is still running."
+	ECHO   If you're not currently using this profile you can continue, otherwise
+	CALL :message "close Firefox first!"
+	ECHO:
+	PAUSE
+	CLS
+	CALL :message "Resuming..."
+	TIMEOUT 5 /nobreak >nul
+)
+GOTO :EOF
+REM ######### Cleanup Function ##########
+:cleanup
+FOR /F tokens^=2^ delims^=^'^" %%G IN ('FINDSTR /R /C:"^[^\"']*user_pref[ 	]*\([ 	]*[\"'][^\"']*[\"'][ 	]*," user.js') DO (
+	IF NOT ""=="%%G" (SET "[%%G]=1")
+)
+(
+	FOR /F "tokens=1,* delims=:" %%G IN ('FINDSTR /N "^" prefs.js') DO (
+		IF ""=="%%H" (
+			ECHO:
+		) ELSE (
+			FOR /F tokens^=1^,2^ delims^=^"^' %%I IN ("%%H") DO (
+				IF NOT DEFINED [%%J] (ECHO:%%H)
+			)
+		)
+	)
+)>tempcleanedprefs
+MOVE /Y tempcleanedprefs prefs.js
+GOTO :EOF
+REM ############### Help ##################
+:showhelp
+MODE 80,34
+CLS
+CALL :message "This script creates a backup of your prefs.js file before doing anything."
+ECHO   It should be safe, but you can follow these steps if something goes wrong:
+ECHO:
+CALL :message "  1. Make sure Firefox is closed."
+ECHO     2. Delete prefs.js in your profile folder.
+CALL :message "  3. Delete Invalidprefs.js if you have one in the same folder."
+ECHO     4. Rename or copy your latest backup to prefs.js.
+CALL :message "  5. Run Firefox and see if you notice anything wrong with it."
+ECHO     6. If you do notice something wrong, especially with your extensions,
+CALL :message "     and/or with the UI, go to about:support, and restart Firefox with"
+ECHO        add-ons disabled. Then, restart it again normally, and see if the
+CALL :message "     problems were solved."
+ECHO:
+CALL :message "If you are able to identify the cause of your issues, please bring it up"
+ECHO   on arkenfox user.js GitHub repository.
+ECHO:
+ECHO:
+PAUSE
+CLS
+GOTO :begin
+REM #####################################

prefsCleaner.sh

@@ -0,0 +1,99 @@
+#!/usr/bin/env bash
+
+## prefs.js cleaner for Linux/Mac
+## author: @claustromaniac
+## version: 1.3
+
+## special thanks to @overdodactyl and @earthlng for a few snippets that I stol..*cough* borrowed from the updater.sh
+
+currdir=$(pwd)
+
+## get the full path of this script (readlink for Linux, greadlink for Mac with coreutils installed)
+sfp=$(readlink -f "${BASH_SOURCE[0]}" 2>/dev/null || greadlink -f "${BASH_SOURCE[0]}" 2>/dev/null)
+
+## fallback for Macs without coreutils
+if [ -z "$sfp" ]; then sfp=${BASH_SOURCE[0]}; fi
+
+## change directory to the Firefox profile directory
+cd "$(dirname "${sfp}")"
+
+fQuit() {
+	## change directory back to the original working directory
+	cd "${currdir}"
+	echo -e "\n$2"
+	exit $1
+}
+
+fFF_check() {
+	# there are many ways to see if firefox is running or not, some more reliable than others
+	# this isn't elegant and might not be future-proof but should at least be compatible with any environment
+	while [ -e lock ]; do
+		echo -e "\nThis Firefox profile seems to be in use. Close Firefox and try again.\n"
+		read -p "Press any key to continue."
+	done
+}
+
+fClean() {
+	# the magic happens here
+	prefs="@@"
+	prefexp="user_pref[ 	]*\([ 	]*[\"']([^\"']+)[\"'][ 	]*,"
+	while read -r line; do
+		if [[ "$line" =~ $prefexp && $prefs != *"@@${BASH_REMATCH[1]}@@"* ]]; then
+			prefs="${prefs}${BASH_REMATCH[1]}@@"
+		fi
+	done <<< "`grep -E \"$prefexp\" user.js`"
+
+	while IFS='' read -r line || [[ -n "$line" ]]; do
+		if [[ "$line" =~ ^$prefexp ]]; then
+			if [[ $prefs != *"@@${BASH_REMATCH[1]}@@"* ]]; then
+				echo "$line"
+			fi
+		else
+			echo "$line"
+		fi
+	done < "$1" > prefs.js
+}
+
+echo -e "\n\n"
+echo "                   ╔══════════════════════════╗"
+echo "                   ║     prefs.js cleaner     ║"
+echo "                   ║    by claustromaniac     ║"
+echo "                   ║           v1.3           ║"
+echo "                   ╚══════════════════════════╝"
+echo -e "\nThis script should be run from your Firefox profile directory.\n"
+echo "It will remove any entries from prefs.js that also exist in user.js."
+echo "This will allow inactive preferences to be reset to their default values."
+echo -e "\nThis Firefox profile shouldn't be in use during the process.\n"
+select option in Start Help Exit; do
+	case $option in
+		Start)
+			if [ ! -e user.js ]; then
+				fQuit 1 "user.js not found in the current directory."
+			elif [ ! -e prefs.js ]; then
+				fQuit 1 "prefs.js not found in the current directory."
+			fi
+
+			fFF_check
+			bakfile="prefs.js.backup.$(date +"%Y-%m-%d_%H%M")"
+			mv prefs.js "${bakfile}" || fQuit 1 "Operation aborted.\nReason: Could not create backup file $bakfile"
+			echo -e "\nprefs.js backed up: $bakfile"
+			echo "Cleaning prefs.js..."
+			fClean "$bakfile"
+			fQuit 0 "All done!"
+			;;
+		Help)
+			echo -e "\nThis script creates a backup of your prefs.js file before doing anything."
+			echo -e "It should be safe, but you can follow these steps if something goes wrong:\n"
+			echo "1. Make sure Firefox is closed."
+			echo "2. Delete prefs.js in your profile folder."
+			echo "3. Delete Invalidprefs.js if you have one in the same folder."
+			echo "4. Rename or copy your latest backup to prefs.js."
+			echo "5. Run Firefox and see if you notice anything wrong with it."
+			echo "6. If you do notice something wrong, especially with your extensions, and/or with the UI, go to about:support, and restart Firefox with add-ons disabled. Then, restart it again normally, and see if the problems were solved."
+			echo -e "If you are able to identify the cause of your issues, please bring it up on the arkenfox user.js GitHub repository.\n"
+			;;
+		Exit)
+			fQuit 0
+			;;
+	esac
+done

scratchpad-scripts/arkenfox-clear-RFP-alternatives.js

@@ -0,0 +1,65 @@
+/***
+ Version: up to and including FF/ESR78
+
+ This will reset the preferences that are under sections 4600 & 4700 in the
+ arkenfox user.js. These are the prefs that are no longer necessary, or they
+ conflict with, privacy.resistFingerprinting if you have that enabled.
+
+ For instructions see:
+ https://github.com/arkenfox/user.js/wiki/3.1-Resetting-Inactive-Prefs-[Scripts]
+***/
+ 
+(function() {
+  let ops = [
+    /* section 4600 */
+    'dom.maxHardwareConcurrency',
+    'dom.enable_resource_timing',
+    'dom.enable_performance',
+    'device.sensors.enabled',
+    'browser.zoom.siteSpecific',
+    'dom.gamepad.enabled',
+    'dom.netinfo.enabled',
+    'media.webspeech.synth.enabled',
+    'media.video_stats.enabled',
+    'dom.w3c_touch_events.enabled',
+    'media.ondevicechange.enabled',
+    'webgl.enable-debug-renderer-info',
+    'dom.w3c_pointer_events.enabled',
+    'ui.use_standins_for_native_colors',
+    'ui.systemUsesDarkTheme',
+    'ui.prefersReducedMotion',
+    /* section 4700 */
+    'general.useragent.override',
+    'general.buildID.override',
+    'general.appname.override',
+    'general.appversion.override',
+    'general.platform.override',
+    'general.oscpu.override',
+    /* reset parrot: check your open about:config after running the script */
+    '_user.js.parrot'
+  ]
+
+  if("undefined" === typeof(Services)) {
+    alert("about:config needs to be the active tab!");
+    return;
+  }
+  
+  let c = 0;
+  for (let i = 0, len = ops.length; i < len; i++) {
+    if (Services.prefs.prefHasUserValue(ops[i])) {   
+      Services.prefs.clearUserPref(ops[i]);
+      if (!Services.prefs.prefHasUserValue(ops[i])) {
+        console.log("reset", ops[i]);
+        c++;
+      } else { console.log("failed to reset", ops[i]); }
+    }
+  }
+  
+  focus();
+  
+  let d = (c==1) ? " pref" : " prefs";
+  if (c > 0) {
+    alert("successfully reset " + c + d + "\n\nfor details check the Browser Console (Ctrl+Shift+J)");
+  } else { alert("nothing to reset"); }
+  
+})();

scratchpad-scripts/arkenfox-clear-deprecated.js

@@ -0,0 +1,248 @@
+/***
+ Version: up to and including FF/ESR78
+
+ This will reset the preferences that have been deprecated by Mozilla
+ and used in the arkenfox user.js
+
+ It is in reverse order, so feel free to remove sections that do not apply
+
+ For instructions see:
+ https://github.com/arkenfox/user.js/wiki/3.1-Resetting-Inactive-Prefs-[Scripts]
+***/
+
+(function() {
+  let ops = [
+    /* deprecated */
+
+    /* 78 */
+    'media.autoplay.enabled.user-gestures-needed',
+    'toolkit.cosmeticAnimations.enabled',
+    /* 77 */
+    'browser.urlbar.oneOffSearches',
+    'browser.tabs.remote.allowLinkedWebInFileUriProcess',
+    /* 76 */
+    'extensions.blocklist.url',
+    /* 74 */
+    'geo.wifi.uri',
+    'geo.wifi.logging.enabled',
+    'privacy.userContext.longPressBehavior',
+    'webgl.disable-extensions',
+    /* 72 */
+    'browser.newtabpage.activity-stream.telemetry.ping.endpoint',
+    'toolkit.telemetry.hybridContent.enabled',
+    'dom.indexedDB.enabled',
+    /* 71 */
+    'devtools.webide.enabled',
+    'devtools.webide.autoinstallADBExtension',
+    'offline-apps.allow_by_default',
+    /* 69 */
+    'gfx.downloadable_fonts.woff2.enabled',
+    'plugins.click_to_play',
+    'media.autoplay.allow-muted',
+    /* 68 */
+    'browser.newtabpage.activity-stream.disableSnippets',
+    'browser.aboutHomeSnippets.updateUrl',
+    'lightweightThemes.update.enabled',
+    'security.csp.experimentalEnabled',
+    /* F67 */
+    'dom.event.highrestimestamp.enabled',
+    'browser.newtabpage.activity-stream.asrouter.userprefs.cfr',
+    /* 66 */
+    'browser.chrome.errorReporter.enabled',
+    'browser.chrome.errorReporter.submitUrl',
+    'network.allow-experiments',
+    /* 65 */
+    'browser.urlbar.autocomplete.enabled',
+    'browser.fixup.hide_user_pass',
+    /* 64 */
+    'browser.onboarding.enabled',
+    'devtools.webide.autoinstallADBHelper',
+    'devtools.webide.adbAddonURL',
+    'security.csp.enable_violation_events',
+    /* 63 */
+    'browser.search.countryCode',
+    'app.update.enabled',
+    'shield.savant.enabled',
+    'browser.chrome.favicons',
+    'media.autoplay.enabled',
+    'network.cookie.lifetime.days',
+    'browser.ctrlTab.previews',
+    /* 62 */
+    'plugin.state.java',
+    /* 61 */
+    'experiments.enabled',
+    'experiments.manifest.uri',
+    'experiments.supported',
+    'experiments.activeExperiment',
+    'network.jar.block-remote-files',
+    'network.jar.open-unsafe-types',
+    /* 60 */
+    'browser.newtabpage.directory.source',
+    'browser.newtabpage.enhanced',
+    'browser.newtabpage.introShown',
+    'extensions.shield-recipe-client.enabled',
+    'extensions.shield-recipe-client.api_url',
+    'browser.newtabpage.activity-stream.enabled',
+    'dom.workers.enabled',
+    /* 59 */
+    'intl.locale.matchOS',
+    'general.useragent.locale',
+    'datareporting.healthreport.about.reportUrl',
+    'dom.flyweb.enabled',
+    'security.mixed_content.use_hsts',
+    'security.mixed_content.send_hsts_priming',
+    'network.http.referer.userControlPolicy',
+    'security.xpconnect.plugin.unrestricted',
+    'media.getusermedia.screensharing.allowed_domains',
+    'camera.control.face_detection.enabled',
+    'dom.disable_window_status_change',
+    'dom.idle-observers-api.enabled',
+    /* 58 */
+    'browser.crashReports.unsubmittedCheck.autoSubmit',
+    /* 57 */
+    'social.whitelist',
+    'social.toast-notifications.enabled',
+    'social.shareDirectory',
+    'social.remote-install.enabled',
+    'social.directories',
+    'social.share.activationPanelEnabled',
+    'social.enabled',
+    'media.eme.chromium-api.enabled',
+    'devtools.webide.autoinstallFxdtAdapters',
+    'browser.casting.enabled',
+    'browser.bookmarks.showRecentlyBookmarked',
+    /* 56 */
+    'extensions.screenshots.system-disabled',
+    'extensions.formautofill.experimental',
+    /* 55 */
+    'geo.security.allowinsecure',
+    'browser.selfsupport.enabled',
+    'browser.selfsupport.url',
+    'browser.newtabpage.directory.ping',
+    'browser.formfill.saveHttpsForms',
+    'browser.formautofill.enabled',
+    'dom.enable_user_timing',
+    'dom.keyboardevent.code.enabled',
+    'browser.tabs.animate',
+    'browser.fullscreen.animate',
+    /* 54 */
+    'browser.safebrowsing.reportMalwareMistakeURL',
+    'browser.safebrowsing.reportPhishMistakeURL',
+    'media.eme.apiVisible',
+    'dom.archivereader.enabled',
+    /* 53 */
+    'security.tls.unrestricted_rc4_fallback',
+    'plugin.scan.Acrobat',
+    'plugin.scan.Quicktime',
+    'plugin.scan.WindowsMediaPlayer',
+    'media.getusermedia.screensharing.allow_on_old_platforms',
+    'dom.beforeAfterKeyboardEvent.enabled',
+    /* 52 */
+    'network.http.sendSecureXSiteReferrer',
+    'media.gmp-eme-adobe.enabled',
+    'media.gmp-eme-adobe.visible',
+    'media.gmp-eme-adobe.autoupdate',
+    'dom.telephony.enabled',
+    'dom.battery.enabled',
+    /* 51 */
+    'media.block-play-until-visible',
+    'dom.vr.oculus050.enabled',
+    'network.http.spdy.enabled.v3-1',
+    /* 50 */
+    'browser.usedOnWindows10.introURL',
+    'plugins.update.notifyUser',
+    'browser.safebrowsing.enabled',
+    'security.ssl3.ecdhe_ecdsa_rc4_128_sha',
+    'security.ssl3.ecdhe_rsa_rc4_128_sha',
+    'security.ssl3.rsa_rc4_128_md5',
+    'security.ssl3.rsa_rc4_128_sha',
+    'plugins.update.url',
+    /* 49 */
+    'loop.enabled',
+    'loop.server',
+    'loop.feedback.formURL',
+    'loop.feedback.manualFormURL',
+    'loop.facebook.appId',
+    'loop.facebook.enabled',
+    'loop.facebook.fallbackUrl',
+    'loop.facebook.shareUrl',
+    'loop.logDomains',
+    'dom.disable_window_open_feature.scrollbars',
+    'dom.push.udp.wakeupEnabled',
+    /* 48 */
+    'browser.urlbar.unifiedcomplete',
+    /* 47 */
+    'toolkit.telemetry.unifiedIsOptIn',
+    'datareporting.healthreport.about.reportUrlUnified',
+    'browser.history.allowPopState',
+    'browser.history.allowPushState',
+    'browser.history.allowReplaceState',
+    /* 46 */
+    'datareporting.healthreport.service.enabled',
+    'datareporting.healthreport.documentServerURI',
+    'datareporting.policy.dataSubmissionEnabled.v2',
+    'browser.safebrowsing.appRepURL',
+    'browser.polaris.enabled',
+    'browser.pocket.enabled',
+    'browser.pocket.api',
+    'browser.pocket.site',
+    'browser.pocket.oAuthConsumerKey',
+    /* 45 */
+    'browser.sessionstore.privacy_level_deferred',
+    /* 44 */
+    'browser.safebrowsing.provider.google.appRepURL',
+    'security.tls.insecure_fallback_hosts.use_static_list',
+    'dom.workers.sharedWorkers.enabled',
+    'dom.disable_image_src_set',
+    /* 43 */
+    'browser.safebrowsing.gethashURL',
+    'browser.safebrowsing.updateURL',
+    'browser.safebrowsing.malware.reportURL',
+    'browser.trackingprotection.gethashURL',
+    'browser.trackingprotection.updateURL',
+    'pfs.datasource.url',
+    'browser.search.showOneOffButtons',
+    /* 42 and earlier */
+    'privacy.clearOnShutdown.passwords', // 42
+    'full-screen-api.approval-required', // 42
+    'browser.safebrowsing.reportErrorURL', // 41
+    'browser.safebrowsing.reportGenericURL', // 41
+    'browser.safebrowsing.reportMalwareErrorURL', // 41
+    'browser.safebrowsing.reportMalwareURL', // 41
+    'browser.safebrowsing.reportURL', // 41
+    'plugins.enumerable_names', // 41
+    'network.http.spdy.enabled.http2draft', // 41
+    'camera.control.autofocus_moving_callback.enabled', // 37
+    'privacy.donottrackheader.value', // 36
+    'network.websocket.enabled', // 35
+    'dom.network.enabled', // 31
+    'pageThumbs.enabled', // 25
+
+    /* reset parrot: check your open about:config after running the script */
+    '_user.js.parrot'
+  ]
+
+  if("undefined" === typeof(Services)) {
+    alert("about:config needs to be the active tab!");
+    return;
+  }
+  
+  let c = 0;
+  for (let i = 0, len = ops.length; i < len; i++) {
+    if (Services.prefs.prefHasUserValue(ops[i])) {   
+      Services.prefs.clearUserPref(ops[i]);
+      if (!Services.prefs.prefHasUserValue(ops[i])) {
+        console.log("reset", ops[i]);
+        c++;
+      } else { console.log("failed to reset", ops[i]); }
+    }
+  }
+  
+  focus();
+  
+  let d = (c==1) ? " pref" : " prefs";
+  if (c > 0) {
+    alert("successfully reset " + c + d + "\n\nfor details check the Browser Console (Ctrl+Shift+J)");
+  } else { alert("nothing to reset"); }
+  
+})();

scratchpad-scripts/arkenfox-clear-removed.js

@@ -0,0 +1,260 @@
+/***
+ This will reset the preferences that have been removed completely from the arkenfox user.js.
+
+ Last updated: 02-Nov-2020
+
+ For instructions see:
+ https://github.com/arkenfox/user.js/wiki/3.1-Resetting-Inactive-Prefs-[Scripts]
+***/
+ 
+(function() {
+  let ops = [
+    /* removed in arkenfox user.js v52-57 */
+    /* 52-alpha */
+    'browser.search.reset.enabled',
+    'browser.search.reset.whitelist',
+    /* 54-alpha */
+    'browser.migrate.automigrate.enabled',
+    'services.sync.enabled',
+    'webextensions.storage.sync.enabled',
+    'webextensions.storage.sync.serverURL',
+    /* 55-alpha */
+    'dom.keyboardevent.dispatch_during_composition', // default is false anyway
+    'dom.vr.oculus.enabled', // covered by dom.vr.enabled
+    'dom.vr.openvr.enabled', // ditto
+    'dom.vr.osvr.enabled', // ditto
+    'extensions.pocket.api', // covered by extensions.pocket.enabled
+    'extensions.pocket.oAuthConsumerKey', // ditto
+    'extensions.pocket.site', // ditto
+    /* 56-alpha: none */
+    /* 57-alpha */
+    'geo.wifi.xhr.timeout', // covered by geo.enabled
+    'browser.search.geoip.timeout', // ditto
+    'media.webspeech.recognition.enable', // default is false anyway
+    'gfx.layerscope.enabled', // default is false anyway
+    /* 58-alpha */
+    //  excluding these e10 settings
+       // 'browser.tabs.remote.autostart',
+       // 'browser.tabs.remote.autostart.2',
+       // 'browser.tabs.remote.force-enable',
+       // 'browser.tabs.remote.separateFileUriProcess',
+       // 'extensions.e10sBlocksEnabling',
+       // 'extensions.webextensions.remote',
+       // 'dom.ipc.processCount',
+       // 'dom.ipc.shims.enabledWarnings',
+       // 'dom.ipc.processCount.extension',
+       // 'dom.ipc.processCount.file',
+       // 'security.sandbox.content.level',
+       // 'dom.ipc.plugins.sandbox-level.default',
+       // 'dom.ipc.plugins.sandbox-level.flash',
+       // 'security.sandbox.logging.enabled',
+    'dom.presentation.controller.enabled',
+    'dom.presentation.discoverable',
+    'dom.presentation.discovery.enabled',
+    'dom.presentation.enabled',
+    'dom.presentation.receiver.enabled',
+    'dom.presentation.session_transport.data_channel.enable',
+    /* 59-alpha */
+    'browser.stopReloadAnimation.enabled',
+    'browser.tabs.insertRelatedAfterCurrent',
+    'browser.tabs.loadDivertedInBackground',
+    'browser.tabs.loadInBackground',
+    'browser.tabs.selectOwnerOnClose',
+    'browser.urlbar.clickSelectsAll',
+    'browser.urlbar.doubleClickSelectsAll',
+    'media.flac.enabled',
+    'media.mediasource.enabled',
+    'media.mediasource.mp4.enabled',
+    'media.mediasource.webm.audio.enabled',
+    'media.mediasource.webm.enabled',
+    'media.mp4.enabled',
+    'media.ogg.enabled',
+    'media.ogg.flac.enabled',
+    'media.opus.enabled',
+    'media.raw.enabled',
+    'media.wave.enabled',
+    'media.webm.enabled',
+    'media.wmf.amd.vp9.enabled',
+    'media.wmf.enabled',
+    'media.wmf.vp9.enabled',
+    'ui.submenuDelay',
+    /* 60-beta - these were all at default anyway */
+    'device.storage.enabled',
+    'general.useragent.compatMode.firefox',
+    'network.dns.blockDotOnion',
+    'network.stricttransportsecurity.preloadlist',
+    'security.block_script_with_wrong_mime',
+    'security.fileuri.strict_origin_policy',
+    'security.sri.enable',
+    /* 61-beta */
+    'browser.laterrun.enabled',
+    'browser.offline-apps.notify',
+    'browser.rights.3.shown',
+    'browser.slowStartup.maxSamples',
+    'browser.slowStartup.notificationDisabled',
+    'browser.slowStartup.samples',
+    'browser.storageManager.enabled',
+    'dom.allow_scripts_to_close_windows',
+    'dom.disable_window_flip',
+    'network.http.fast-fallback-to-IPv4',
+    'offline-apps.quota.warn',
+    'services.blocklist.signing.enforced',
+    /* 62-beta */
+    'browser.urlbar.autoFill.typed',
+    'security.tls.version.fallback-limit',
+    /* 63-beta */
+    'extensions.webextensions.keepStorageOnUninstall',
+    'extensions.webextensions.keepUuidOnUninstall',
+    'privacy.trackingprotection.ui.enabled',
+    /* 64-beta */
+    'browser.eme.ui.enabled',
+    'browser.sessionstore.max_windows_undo',
+    'network.auth.subresource-img-cross-origin-http-auth-allow',
+    'media.peerconnection.ice.tcp',
+    'media.peerconnection.identity.enabled',
+    'media.peerconnection.identity.timeout',
+    'media.peerconnection.turn.disable',
+    'media.peerconnection.use_document_iceservers',
+    'media.peerconnection.video.enabled',
+    'media.navigator.video.enabled',
+    /* 65-beta */
+    'browser.contentblocking.enabled',
+    'browser.urlbar.maxHistoricalSearchSuggestions',
+    /* 67-beta */
+    'app.update.service.enabled',
+    'app.update.silent',
+    'app.update.staging.enabled',
+    'browser.cache.disk.capacity',
+    'browser.cache.disk.smart_size.enabled',
+    'browser.cache.disk.smart_size.first_run',
+    'browser.cache.offline.insecure.enable',
+    'browser.safebrowsing.downloads.remote.url',
+    'browser.safebrowsing.provider.google.reportMalwareMistakeURL',
+    'browser.safebrowsing.provider.google.reportPhishMistakeURL',
+    'browser.safebrowsing.provider.google.reportURL',
+    'browser.safebrowsing.provider.google4.dataSharing.enabled',
+    'browser.safebrowsing.provider.google4.dataSharingURL',
+    'browser.safebrowsing.provider.google4.reportMalwareMistakeURL',
+    'browser.safebrowsing.provider.google4.reportPhishMistakeURL',
+    'browser.safebrowsing.provider.google4.reportURL',
+    'browser.safebrowsing.reportPhishURL',
+    'browser.sessionhistory.max_total_viewers',
+    'browser.urlbar.filter.javascript',
+    'canvas.capturestream.enabled',
+    'dom.imagecapture.enabled',
+    'dom.popup_maximum',
+    'gfx.offscreencanvas.enabled',
+    'javascript.options.shared_memory',
+    'media.gmp-gmpopenh264.autoupdate',
+    'media.gmp-gmpopenh264.enabled',
+    'media.gmp-manager.updateEnabled',
+    'media.gmp-manager.url',
+    'media.gmp-manager.url.override',
+    'media.gmp.trial-create.enabled',
+    'media.gmp-widevinecdm.autoupdate',
+    'network.cookie.leave-secure-alone',
+    'network.cookie.same-site.enabled',
+    'network.dnsCacheEntries',
+    'network.dnsCacheExpiration',
+    'network.proxy.autoconfig_url.include_path',
+    'pdfjs.enableWebGL',
+    'plugin.default.state',
+    'plugin.defaultXpi.state',
+    'plugin.scan.plid.all',
+    'security.data_uri.block_toplevel_data_uri_navigations',
+    'security.insecure_field_warning.contextual.enabled',
+    'security.insecure_password.ui.enabled',
+    'signon.autofillForms.http',
+    'signon.storeWhenAutocompleteOff',
+    'xpinstall.whitelist.required',
+    /* 67-beta: Blocklist, SB & TP cleanup: these were all inactive */
+    'browser.safebrowsing.downloads.remote.block_dangerous',
+    'browser.safebrowsing.downloads.remote.block_dangerous_host',
+    'browser.safebrowsing.blockedURIs.enabled',
+    'browser.safebrowsing.provider.google.gethashURL',
+    'browser.safebrowsing.provider.google.updateURL',
+    'browser.safebrowsing.provider.google4.gethashURL',
+    'browser.safebrowsing.provider.google4.updateURL',
+    'browser.safebrowsing.provider.mozilla.gethashURL',
+    'browser.safebrowsing.provider.mozilla.updateURL',
+    'browser.urlbar.userMadeSearchSuggestionsChoice',
+    'privacy.trackingprotection.annotate_channels',
+    'privacy.trackingprotection.enabled',
+    'privacy.trackingprotection.lower_network_priority',
+    'privacy.trackingprotection.pbmode.enabled',
+    'services.blocklist.addons.collection',
+    'services.blocklist.gfx.collection',
+    'services.blocklist.onecrl.collection',
+    'services.blocklist.plugins.collection',
+    'services.blocklist.update_enabled',
+    'urlclassifier.trackingTable',
+    /* 68-beta */
+    'dom.forms.datetime',
+    'font.blacklist.underline_offset',
+    'font.name.monospace.x-unicode',
+    'font.name.monospace.x-western',
+    'font.name.sans-serif.x-unicode',
+    'font.name.sans-serif.x-western',
+    'font.name.serif.x-unicode',
+    'font.name.serif.x-western',
+    'layout.css.font-loading-api.enabled',
+    'toolkit.telemetry.cachedClientID',
+    /* 69-beta */
+    'plugin.sessionPermissionNow.intervalInMinutes',
+    /* 70-beta */
+    'browser.cache.disk_cache_ssl',
+    'browser.sessionhistory.max_entries',
+    'dom.push.connection.enabled',
+    'dom.push.serverURL',
+    'extensions.getAddons.discovery.api_url',
+    'extensions.htmlaboutaddons.discover.enabled',
+    'extensions.webservice.discoverURL',
+    'intl.locale.requested',
+    'intl.regional_prefs.use_os_locales',
+    'privacy.usercontext.about_newtab_segregation.enabled',
+    'security.insecure_connection_icon.pbmode.enabled',
+    'security.insecure_connection_text.pbmode.enabled',
+    'webgl.dxgl.enabled',
+    /* 71-beta */
+    'media.block-autoplay-until-in-foreground',
+    'middlemouse.paste',
+    /* 75-beta */
+    'browser.search.geoip.url',
+    'browser.search.region',
+    /* 79-beta */
+    'browser.urlbar.usepreloadedtopurls.enabled',
+    /* 80 */
+    'dom.IntersectionObserver.enabled',
+    /* 82-beta */
+    'extensions.screenshots.upload-disabled',
+    'privacy.partition.network_state',
+    'security.ssl3.dhe_rsa_aes_128_sha',
+    'security.ssl3.dhe_rsa_aes_256_sha',
+    /* reset parrot: check your open about:config after running the script */
+    '_user.js.parrot'
+  ]
+
+  if("undefined" === typeof(Services)) {
+    alert("about:config needs to be the active tab!");
+    return;
+  }
+  
+  let c = 0;
+  for (let i = 0, len = ops.length; i < len; i++) {
+    if (Services.prefs.prefHasUserValue(ops[i])) {   
+      Services.prefs.clearUserPref(ops[i]);
+      if (!Services.prefs.prefHasUserValue(ops[i])) {
+        console.log("reset", ops[i]);
+        c++;
+      } else { console.log("failed to reset", ops[i]); }
+    }
+  }
+  
+  focus();
+  
+  let d = (c==1) ? " pref" : " prefs";
+  if (c > 0) {
+    alert("successfully reset " + c + d + "\n\nfor details check the Browser Console (Ctrl+Shift+J)");
+  } else { alert("nothing to reset"); }
+  
+})();

scratchpad-scripts/troubleshooter.js

@@ -0,0 +1,214 @@
+
+/*** arkenfox user.js troubleshooter.js v1.6.2 ***/
+
+(function() {
+
+  if ("undefined" === typeof(Services)) return alert('about:config needs to be the active tab!');
+
+  const aPREFS = [
+
+    /* known culprits */
+    'network.cookie.cookieBehavior',
+    'network.http.referer.XOriginPolicy',
+    'privacy.firstparty.isolate',
+    'privacy.resistFingerprinting',
+    'security.mixed_content.block_display_content',
+    'svg.disabled',
+
+    /* Storage + Cache */
+    'browser.cache.offline.enable',
+    'dom.indexedDB.enabled',
+    'dom.storage.enabled',
+    'browser.storageManager.enabled',
+    'dom.storageManager.enabled',
+
+    /* Workers, Web + Push Notifications */
+    'dom.caches.enabled',
+    'dom.push.connection.enabled',
+    'dom.push.enabled',
+    'dom.push.serverURL',
+    'dom.serviceWorkers.enabled',
+    'dom.webnotifications.enabled',
+    'dom.webnotifications.serviceworker.enabled',
+
+    /* Fonts */
+    'browser.display.use_document_fonts',
+    'font.blacklist.underline_offset',
+    'gfx.downloadable_fonts.woff2.enabled',
+    'gfx.font_rendering.graphite.enabled',
+    'gfx.font_rendering.opentype_svg.enabled',
+    'layout.css.font-loading-api.enabled',
+
+    /* Misc */
+    'browser.link.open_newwindow.restriction',
+    'canvas.capturestream.enabled',
+    'dom.event.clipboardevents.enabled',
+    'dom.event.contextmenu.enabled',
+    'dom.IntersectionObserver.enabled',
+    'dom.popup_allowed_events',
+    'full-screen-api.enabled',
+    'geo.wifi.uri',
+    'intl.accept_languages',
+    'javascript.options.asmjs',
+    'javascript.options.wasm',
+    'permissions.default.shortcuts',
+    'security.csp.experimentalEnabled',
+
+    /* Hardware */
+    'dom.vr.enabled',
+    'media.ondevicechange.enabled',
+
+    /* Audio + Video */
+    'dom.webaudio.enabled',
+    'media.autoplay.enabled',
+    'media.autoplay.default', // FF63+
+    'media.autoplay.blocking_policy', // FF78+
+
+    /* Forms */
+    'browser.formfill.enable',
+    'signon.autofillForms',
+    'signon.formlessCapture.enabled',
+
+    /* HTTPS */
+    'security.cert_pinning.enforcement_level',
+    'security.family_safety.mode',
+    'security.OCSP.require',
+    'security.pki.sha1_enforcement_level',
+    'security.ssl.require_safe_negotiation',
+    'security.ssl.treat_unsafe_negotiation_as_broken',
+    'security.ssl3.dhe_rsa_aes_128_sha',
+    'security.ssl3.dhe_rsa_aes_256_sha',
+    'security.ssl3.ecdhe_ecdsa_aes_128_sha',
+    'security.ssl3.ecdhe_rsa_aes_128_sha',
+    'security.ssl3.rsa_aes_128_sha',
+    'security.ssl3.rsa_aes_256_sha',
+    'security.ssl3.rsa_des_ede3_sha',
+    'security.tls.enable_0rtt_data',
+    'security.tls.version.max',
+    'security.tls.version.min',
+
+    /* Plugins + Flash */
+    'plugin.default.state',
+    'plugin.defaultXpi.state',
+    'plugin.sessionPermissionNow.intervalInMinutes',
+    'plugin.state.flash',
+
+    /* unlikely to cause problems */
+    'browser.tabs.remote.allowLinkedWebInFileUriProcess',
+    'dom.popup_maximum',
+    'layout.css.visited_links_enabled',
+    'mathml.disabled',
+    'network.auth.subresource-http-auth-allow',
+    'network.http.redirection-limit',
+    'network.protocol-handler.external.ms-windows-store',
+    'privacy.trackingprotection.enabled',
+    'security.data_uri.block_toplevel_data_uri_navigations',
+
+    'last.one.without.comma'
+  ]
+
+  // any runtime-set pref that everyone will have and that can be safely reset
+  const oFILLER = { type: 64, name: 'app.update.lastUpdateTime.browser-cleanup-thumbnails', value: 1580000000 };
+
+  function getMyList(arr) {
+    const aRet = [];
+    for (const sPname of arr) {
+      if (Services.prefs.prefHasUserValue(sPname)) {
+        const ptype = Services.prefs.getPrefType(sPname);
+        switch (ptype) {
+          case 32: // string (see https://dxr.mozilla.org/mozilla-central/source/modules/libpref/nsIPrefBranch.idl#31)
+            aRet.push({'type':ptype,'name':sPname,'value':Services.prefs.getCharPref(sPname)});
+            break;
+          case 64: // int
+            aRet.push({'type':ptype,'name':sPname,'value':Services.prefs.getIntPref(sPname)});
+            break;
+          case 128: // boolean
+            aRet.push({'type':ptype,'name':sPname,'value':Services.prefs.getBoolPref(sPname)});
+            break;
+          default:
+            console.log("error detecting pref-type for '"+sPname+"' !");
+        }
+      }
+    }
+    return aRet;
+  }
+
+  function reapply(arr) {
+    for (const oPref of arr) {
+      switch (oPref.type) {
+        case 32: // string
+          Services.prefs.setCharPref(oPref.name, oPref.value);
+          break;
+        case 64: // int
+          Services.prefs.setIntPref(oPref.name, oPref.value);
+          break;
+        case 128: // boolean
+          Services.prefs.setBoolPref(oPref.name, oPref.value);
+          break;
+        default:
+          console.log("error re-appyling value for '"+oPref.name+"' !"); // should never happen
+      }
+    }
+  }
+
+  function myreset(arr) {
+    for (const oPref of arr) Services.prefs.clearUserPref(oPref.name);
+  }
+
+  function resetAllMatchingDefault(arr) {
+    const aTmp = getMyList(arr);
+    myreset(aTmp);
+    reapply(aTmp);
+  }
+
+  function _main(aALL) {
+    const _h = (arr) => Math.ceil(arr.length/2);
+
+    let aTmp = aALL, aDbg = aALL;
+    reapply(aALL);
+    myreset(aTmp.slice(0, _h(aTmp)));
+    while (aTmp.length) {
+      alert("NOW TEST AGAIN !");
+      if (confirm("if the problem still exists click OK, otherwise click cancel.")) {
+        aTmp = aTmp.slice(_h(aTmp));
+      } else {
+        aTmp = aTmp.slice(0, _h(aTmp));
+        aDbg = aTmp; // update narrowed down list
+        if (aDbg.length == 1) break;
+      }
+      reapply(aALL);
+      myreset(aTmp.slice(0, _h(aTmp))); // reset half of the remaining prefs
+    }
+    reapply(aALL);
+
+    if (aDbg.length == 1) return alert("narrowed it down to:\n\n"+aDbg[0].name+"\n");
+    if (aDbg.length == aALL.length) {
+      let msg = "Failed to narrow it down beyond the initial "+aALL.length+" prefs. The problem is most likely caused by at least 2 prefs!\n\n";
+      msg += "Either those prefs are too far apart in the list or there are exactly 2 culprits and they just happen to be at the wrong place.\n\n";
+      msg += "In case it's the latter, the script can add a dummy pref and you can try again - Try again?";
+      if (confirm(msg)) return _main([...aALL, oFILLER]);
+    } else if (aDbg.length > 10 && confirm("Narrowed it down to "+aDbg.length+" prefs. Try narrowing it down further?")) {
+      return _main(aDbg.reverse());
+    }
+
+    alert("Narrowed it down to "+ aDbg.length.toString() +" prefs, check the console ...");
+    console.log("The problem is caused by 2 or more of these prefs:");
+    for (const oPref of aDbg) console.log(oPref.name);
+  }
+
+
+  resetAllMatchingDefault(aPREFS); // reset user-set prefs matching FFs default value
+
+  const aBAK = getMyList(aPREFS);
+  //console.log(aBAK.length, "user-set prefs from our list detected and their values stored.");
+
+  focus();
+  myreset(aBAK);
+  if (!confirm("all detected prefs reset.\n\n!! KEEP THIS PROMPT OPEN AND TEST THE SITE IN ANOTHER TAB !!\n\nIF the problem still exists, this script can't help you - click cancel to re-apply your values and exit.\n\nClick OK if your problem is fixed.")) {
+    reapply(aBAK);
+    return;
+  }
+
+  _main(aBAK);
+
+})();

updater.bat

@@ -0,0 +1,318 @@
+@ECHO OFF & SETLOCAL EnableDelayedExpansion
+TITLE arkenfox user.js updater
+
+REM ## arkenfox user.js updater for Windows
+REM ## author: @claustromaniac
+REM ## version: 4.12
+REM ## instructions: https://github.com/arkenfox/user.js/wiki/3.3-Updater-Scripts
+
+SET v=4.12
+
+VERIFY ON
+CD /D "%~dp0"
+SET _myname=%~n0
+SET _myparams=%*
+
+:parse
+IF "%~1"=="" (GOTO endparse)
+IF /I "%~1"=="-unattended" (SET _ua=1)
+IF /I "%~1"=="-log" (SET _log=1)
+IF /I "%~1"=="-logp" (SET _log=1 & SET _logp=1)
+IF /I "%~1"=="-multioverrides" (SET _multi=1)
+IF /I "%~1"=="-merge" (SET _merge=1)
+IF /I "%~1"=="-updatebatch" (SET _updateb=1)
+IF /I "%~1"=="-singlebackup" (SET _singlebackup=1)
+IF /I "%~1"=="-esr" (SET _esr=1)
+IF /I "%~1"=="-rfpalts" (SET _rfpalts=1)
+SHIFT
+GOTO parse
+:endparse
+
+IF DEFINED _updateb (
+	REM The normal flow here goes from phase 1 to phase 2 and then phase 3.
+	IF NOT "!_myname:~0,9!"=="[updated]" (
+		IF EXIST "[updated]!_myname!.bat" (
+			REM ## Phase 3 ##: The new script, with the original name, will:
+			REM 	* Delete the [updated]*.bat and *.bat.old scripts
+			REM 	* Begin the normal routine
+			FC "[updated]!_myname!.bat" "!_myname!.bat.old" >nul
+			IF NOT "!errorlevel!"=="0" (
+				CALL :message "Script updated to version !v!"
+				TIMEOUT 3 >nul
+			)
+			REN "[updated]!_myname!.bat" "[updated]!_myname!.bat.old"
+			DEL /F "!_myname!.bat.old" "[updated]!_myname!.bat.old"
+			GOTO begin
+		)
+		REM ## Phase 1 ##
+		REM 	* Download new batch and name it [updated]*.bat
+		REM 	* Start that script in a new CMD window
+		REM 	* Exit
+		CALL :message "Updating script..."
+		REM Uncomment the next line and comment out the PowerShell call for testing.
+		REM COPY /B /Y "!_myname!.bat" "[updated]!_myname!.bat" >nul
+		(
+			PowerShell -Command "(New-Object Net.WebClient).DownloadFile('https://raw.githubusercontent.com/arkenfox/user.js/master/updater.bat', '[updated]!_myname!.bat')"
+		) >nul 2>&1
+		IF EXIST "[updated]!_myname!.bat" (
+			START /min CMD /C "[updated]!_myname!.bat" !_myparams!
+		) ELSE (
+			CALL :message "Failed. Make sure PowerShell is allowed internet access."
+			TIMEOUT 120 >nul
+		)
+	) ELSE (
+		IF "!_myname!"=="[updated]" (
+			CALL :message "The [updated] label is reserved. Rename this script and try again."
+			TIMEOUT 300 >nul
+		) ELSE (
+			REM ## Phase 2 ##: The [updated]*.bat script will:
+			REM 	* Rename the old script and make a copy of itself with the original name.
+			REM 	* Run that copy in a new CMD instance
+			REM 	* Exit
+			IF EXIST "!_myname:~9!.bat" ( REN "!_myname:~9!.bat" "!_myname:~9!.bat.old" )
+			COPY /B /Y "!_myname!.bat" "!_myname:~9!.bat"
+			START CMD /C "!_myname:~9!.bat" !_myparams!
+		)
+	)
+	EXIT /B
+)
+
+:begin
+CLS
+ECHO:
+ECHO:
+ECHO:                ########################################
+ECHO:                ####  user.js Updater for Windows   ####
+ECHO:                ####       by claustromaniac        ####
+ECHO:                ####             v!v!              ####
+ECHO:                ########################################
+ECHO:
+SET /A "_line=0"
+IF NOT EXIST user.js (
+	CALL :message "user.js not detected in the current directory."
+) ELSE (
+	FOR /F "skip=1 tokens=1,* delims=:" %%G IN (user.js) DO (
+		SET /A "_line+=1"
+		IF !_line! GEQ 4 (GOTO exitloop)
+		IF !_line! EQU 1 (SET _name=%%H)
+		IF !_line! EQU 2 (SET _date=%%H)
+		IF !_line! EQU 3 (SET _version=%%G)
+	)
+	:exitloop
+	IF NOT "!_name!"=="" (
+		SET "_tempvar="
+		IF /I NOT "!_name!"=="!_name:ghacks=!" SET _tempvar=1
+		IF /I NOT "!_name!"=="!_name:arkenfox=!" SET _tempvar=1
+		IF !_tempvar! EQU 1 (
+			CALL :message "!_name! !_version:~2!,!_date!"
+		) ELSE (CALL :message "Current user.js version not recognised.")
+	) ELSE (CALL :message "Current user.js version not recognised.")
+)
+ECHO:
+IF NOT DEFINED _ua (
+	CALL :message "This batch should be run from your Firefox profile directory."
+	ECHO:  It will download the latest version of arkenfox user.js from github and then
+	CALL :message "append any of your own changes from user-overrides.js to it."
+	CALL :message "Visit the wiki for more detailed information."
+	ECHO:
+	TIMEOUT 1 /nobreak >nul
+	CHOICE /C SHE /N /M "Start [S] Help [H] Exit [E]"
+	CLS
+	IF ERRORLEVEL 3 (EXIT /B)
+	IF ERRORLEVEL 2 (GOTO :showhelp)
+)
+IF DEFINED _log (
+	CALL :log >>user.js-update-log.txt 2>&1
+	IF DEFINED _logp (START user.js-update-log.txt)
+	EXIT /B
+	:log
+	SET _log=2
+	ECHO:##################################################################
+	ECHO:  %date%, %time%
+)
+IF EXIST user.js.new (DEL /F "user.js.new")
+CALL :message "Retrieving latest user.js file from github repository..."
+(
+	PowerShell -Command "(New-Object Net.WebClient).DownloadFile('https://raw.githubusercontent.com/arkenfox/user.js/master/user.js', 'user.js.new')"
+) >nul 2>&1
+IF EXIST user.js.new (
+	IF DEFINED _rfpalts (
+		CALL :message "Activating RFP Alternatives section..."
+		CALL :activate user.js.new "[SETUP-non-RFP]"
+	)
+	IF DEFINED _esr (
+		CALL :message "Activating ESR section..."
+		CALL :activate user.js.new ".x still uses all the following prefs"
+	)
+	IF DEFINED _multi (
+		FORFILES /P user.js-overrides /M *.js >nul 2>&1
+		IF NOT ERRORLEVEL 1 (
+			IF DEFINED _merge (
+				CALL :message "Merging..."
+				COPY /B /Y user.js-overrides\*.js user-overrides-merged.js
+				CALL :merge user-overrides-merged.js
+				COPY /B /Y user.js.new+user-overrides-merged.js user.js.new
+				CALL :merge user.js.new
+			) ELSE (
+				CALL :message "Appending..."
+				COPY /B /Y user.js.new+"user.js-overrides\*.js" user.js.new
+			)
+		) ELSE (CALL :message "No override files found.")
+	) ELSE (
+		IF EXIST "user-overrides.js" (
+			COPY /B /Y user.js.new+"user-overrides.js" "user.js.new"
+			IF DEFINED _merge (
+				CALL :message "Merging user-overrides.js..."
+				CALL :merge user.js.new
+			) ELSE (
+				CALL :message "user-overrides.js appended."
+			)
+		) ELSE (CALL :message "user-overrides.js not found.")
+	)
+	IF EXIST user.js (
+		FC user.js.new user.js >nul && SET "_changed=false" || SET "_changed=true"
+	)
+	IF "!_changed!"=="true" (
+		CALL :message "Backing up..."
+		IF DEFINED _singlebackup (
+			MOVE /Y user.js user.js.bak >nul
+		) ELSE (
+			SET "_time=!time: =0!"
+			MOVE /Y user.js "user-backup-!date:/=-!_!_time::=.!.js" >nul
+		)
+		REN user.js.new user.js
+		CALL :message "Update complete."
+	) ELSE (
+		IF "!_changed!"=="false" (
+			DEL /F user.js.new >nul
+			CALL :message "Update completed without changes."
+		) ELSE (
+			REN user.js.new user.js
+			CALL :message "Update complete."
+			SET "_changed=true"
+		)
+	)
+) ELSE (
+	CALL :message "Update failed. Make sure PowerShell is allowed internet access."
+	ECHO:  No changes were made.
+)
+IF NOT DEFINED _log (
+	IF NOT DEFINED _ua (
+		IF EXIST prefsCleaner.bat (
+			IF "!_changed!"=="true" (
+				CALL :message "Would you like to run the prefsCleaner now?"
+				CHOICE /C YN /N /M "(Y/N) "
+				IF "1"=="!errorlevel!" ( START "" cmd.exe /C "prefsCleaner.bat" )
+			) ELSE (PAUSE)
+		) ELSE (PAUSE)
+	)
+)
+EXIT /B
+
+::::::::::::::: Message :::::::::::::::
+:message
+SETLOCAL DisableDelayedExpansion
+IF NOT "2"=="%_log%" (ECHO:)
+ECHO:  %~1
+IF NOT "2"=="%_log%" (ECHO:)
+ENDLOCAL
+GOTO :EOF
+
+::::::::::::::: Activate Section :::::::::::::::
+:activate
+:: arg1 = file
+:: arg2 = line substring
+SETLOCAL DisableDelayedExpansion
+(
+	FOR /F "tokens=1,* delims=:" %%G IN ('FINDSTR /N "^" "%~1"') DO (
+		SET "_temp=%%H"
+		SETLOCAL EnableDelayedExpansion
+		IF "!_temp:%~2=!"=="!_temp!" (
+			ENDLOCAL & ECHO:%%H
+		) ELSE (
+			ECHO://!_temp:~2!
+			ENDLOCAL
+		)
+	)
+)>updatertempfile
+MOVE /Y updatertempfile "%~1" >nul
+ENDLOCAL
+GOTO :EOF
+
+::::::::::::::: Merge :::::::::::::::
+:merge
+SETLOCAL DisableDelayedExpansion
+FOR /F tokens^=2^,^*^ delims^=^'^" %%G IN ('FINDSTR /R /C:"^user_pref[ 	]*\([ 	]*[\"'].*[\"'][ 	]*,.*\)[ 	]*;" "%~1"') DO (SET "[%%G]=%%H")
+FOR /F tokens^=2^,^*^ delims^=^' %%G IN ('FINDSTR /R /C:"^//// --- comment-out --- '[^'][^']*'.*" "%~1"') DO (SET "__unset__%%G=1")
+(
+	FOR /F "tokens=1,* delims=:" %%I IN ('FINDSTR /N "^" "%~1"') DO (
+		SET "_temp=%%J"
+		SETLOCAL EnableDelayedExpansion
+		IF NOT "!_temp:~0,9!"=="user_pref" (
+			ENDLOCAL & ECHO:%%J
+		) ELSE (
+			IF "!_temp:;=!"=="!_temp!" (
+				ENDLOCAL & ECHO:%%J
+			) ELSE (
+				ENDLOCAL
+				FOR /F tokens^=2^ delims^=^'^" %%K IN ("%%J") DO (
+					IF NOT "_user.js.parrot"=="%%K" (
+						IF DEFINED __unset__%%K (
+							ECHO://%%J
+						) ELSE (
+							IF DEFINED [%%K] (
+								SETLOCAL EnableDelayedExpansion
+								FOR /F "delims=" %%L IN ("![%%K]!") DO (
+									ENDLOCAL & ECHO:user_pref("%%K"%%L
+									SET "[%%K]="
+								)
+							)
+						)
+					) ELSE (ECHO:%%J)
+				)
+			)
+		)
+	)
+)>updatertempfile
+MOVE /Y updatertempfile "%~1" >nul
+ENDLOCAL
+GOTO :EOF
+
+::::::::::::::: Help :::::::::::::::
+:showhelp
+MODE 80,54
+CLS
+CALL :message "Available arguments (case-insensitive):"
+CALL :message "  -esr"
+ECHO:     Activate ESR related preferences
+CALL :message "  -log"
+ECHO:     Write the console output to a logfile (user.js-update-log.txt)
+CALL :message "  -logP"
+ECHO:     Like -log, but also open the logfile after updating.
+CALL :message "  -merge"
+ECHO:     Merge overrides instead of appending them. Single-line comments and
+ECHO:     _user.js.parrot lines are appended normally. Overrides for inactive
+ECHO:     user.js prefs will be appended. When -Merge and -MultiOverrides are used
+ECHO:     together, a user-overrides-merged.js file is also generated in the root
+ECHO:     directory for quick reference. It contains only the merged data from
+ECHO:     override files and can be safely discarded after updating, or used as the
+ECHO:     new user-overrides.js. When there are conflicting records for the same
+ECHO:     pref, the value of the last one declared will be used. Visit the wiki
+ECHO:     for usage examples and more detailed information.
+CALL :message "  -multiOverrides"
+ECHO:     Use any and all .js files in a user.js-overrides sub-folder as overrides
+ECHO:     instead of the default user-overrides.js file. Files are appended in
+ECHO:     alphabetical order.
+CALL :message "  -unattended"
+ECHO:     Run without user input.
+CALL :message "  -singleBackup"
+ECHO:     Use a single backup file and overwrite it on new updates, instead of
+ECHO:     cumulative backups. This was the default behaviour before v4.3.
+CALL :message "  -rfpAlts"
+ECHO:     Activate RFP Alternatives section
+CALL :message "  -updateBatch"
+ECHO:     Update the script itself on execution, before the normal routine.
+CALL :message ""
+PAUSE
+MODE 80,25
+GOTO :begin

updater.sh

@@ -0,0 +1,399 @@
+#!/usr/bin/env bash
+
+## arkenfox user.js updater for macOS and Linux
+
+## version: 2.8
+## Author: Pat Johnson (@overdodactyl)
+## Additional contributors: @earthlng, @ema-pe, @claustromaniac
+
+## DON'T GO HIGHER THAN VERSION x.9 !! ( because of ASCII comparison in update_updater() )
+
+readonly CURRDIR=$(pwd)
+
+sfp=$(readlink -f "${BASH_SOURCE[0]}" 2>/dev/null || greadlink -f "${BASH_SOURCE[0]}" 2>/dev/null)
+[ -z "$sfp" ] && sfp=${BASH_SOURCE[0]}
+readonly SCRIPT_DIR=$(dirname "${sfp}")
+
+
+#########################
+#    Base variables     #
+#########################
+
+# Colors used for printing
+RED='\033[0;31m'
+BLUE='\033[0;34m'
+BBLUE='\033[1;34m'
+GREEN='\033[0;32m'
+ORANGE='\033[0;33m'
+CYAN='\033[0;36m'
+NC='\033[0m' # No Color
+
+# Argument defaults
+UPDATE='check'
+CONFIRM='yes'
+OVERRIDE='user-overrides.js'
+BACKUP='multiple'
+COMPARE=false
+SKIPOVERRIDE=false
+VIEW=false
+PROFILE_PATH=false
+ESR=false
+
+# Download method priority: curl -> wget
+DOWNLOAD_METHOD=''
+if [[ $(command -v 'curl') ]]; then
+  DOWNLOAD_METHOD='curl --max-redirs 3 -so'
+elif [[ $(command -v 'wget') ]]; then
+  DOWNLOAD_METHOD='wget --max-redirect 3 --quiet -O'
+else
+  echo -e "${RED}This script requires curl or wget.\nProcess aborted${NC}"
+  exit 1
+fi
+
+
+show_banner () {
+  echo -e "${BBLUE}
+                ############################################################################
+                ####                                                                    ####
+                ####                          arkenfox user.js                          ####
+                ####       Hardening the Privacy and Security Settings of Firefox       ####
+                ####           Maintained by @Thorin-Oakenpants and @earthlng           ####
+                ####            Updater for macOS and Linux by @overdodactyl            ####
+                ####                                                                    ####
+                ############################################################################"
+  echo -e "${NC}\n"
+  echo -e "Documentation for this script is available here: ${CYAN}https://github.com/arkenfox/user.js/wiki/3.3-Updater-Scripts${NC}\n"
+}
+
+#########################
+#      Arguments        #
+#########################
+
+usage() {
+  echo
+  echo -e "${BLUE}Usage: $0 [-bcdehlnrsuv] [-p PROFILE] [-o OVERRIDE]${NC}" 1>&2  # Echo usage string to standard error
+  echo -e "
+Optional Arguments:
+    -h           Show this help message and exit.
+    -p PROFILE   Path to your Firefox profile (if different than the dir of this script)
+                 IMPORTANT: If the path contains spaces, wrap the entire argument in quotes.
+    -l           Choose your Firefox profile from a list
+    -u           Update updater.sh and execute silently.  Do not seek confirmation.
+    -d           Do not look for updates to updater.sh.
+    -s           Silently update user.js.  Do not seek confirmation.
+    -b           Only keep one backup of each file.
+    -c           Create a diff file comparing old and new user.js within userjs_diffs.
+    -o OVERRIDE  Filename or path to overrides file (if different than user-overrides.js).
+                 If used with -p, paths should be relative to PROFILE or absolute paths
+                 If given a directory, all files inside will be appended recursively.
+                 You can pass multiple files or directories by passing a comma separated list.
+                     Note: If a directory is given, only files inside ending in the extension .js are appended
+                     IMPORTANT: Do not add spaces between files/paths.  Ex: -o file1.js,file2.js,dir1
+                     IMPORTANT: If any file/path contains spaces, wrap the entire argument in quotes.
+                         Ex: -o \"override folder\"
+    -n           Do not append any overrides, even if user-overrides.js exists.
+    -v           Open the resulting user.js file.
+    -r           Only download user.js to a temporary file and open it.
+    -e           Activate ESR related preferences."
+  echo
+  exit 1
+}
+
+#########################
+#     File Handling     #
+#########################
+
+# Download files
+download_file () { # expects URL as argument ($1)
+  declare -r tf=$(mktemp)
+
+  $DOWNLOAD_METHOD "${tf}" "$1" && echo "$tf" || echo '' # return the temp-filename or empty string on error
+}
+
+open_file () { # expects one argument: file_path
+  if [ "$(uname)" == 'Darwin' ]; then
+    open "$1"
+  elif [ "$(uname -s | cut -c -5)" == "Linux" ]; then
+    xdg-open "$1"
+  else
+    echo -e "${RED}Error: Sorry, opening files is not supported for your OS.${NC}"
+  fi
+}
+
+readIniFile () { # expects one argument: absolute path of profiles.ini
+  declare -r inifile="$1"
+  declare -r tfile=$(mktemp)
+
+  if [ $(grep '^\[Profile' "$inifile" | wc -l) == "1" ]; then ### only 1 profile found
+    grep '^\[Profile' -A 4 "$inifile" | grep -v '^\[Profile' > $tfile
+  else
+    grep -E -v '^\[General\]|^StartWithLastProfile=|^IsRelative=' "$inifile"
+    echo ''
+    read -p 'Select the profile number ( 0 for Profile0, 1 for Profile1, etc ) : ' -r
+    echo -e "\n"
+    if [[ $REPLY =~ ^(0|[1-9][0-9]*)$ ]]; then
+      grep '^\[Profile'${REPLY} -A 4 "$inifile" | grep -v '^\[Profile'${REPLY} > $tfile
+      if [[ "$?" != "0" ]]; then
+        echo "Profile${REPLY} does not exist!" && exit 1
+      fi
+    else
+      echo "Invalid selection!" && exit 1
+    fi
+  fi
+
+  declare -r profpath=$(grep '^Path=' $tfile)
+  declare -r pathisrel=$(grep '^IsRelative=' $tfile)
+
+  rm "$tfile"
+
+  # update global variable
+  if [[ ${pathisrel#*=} == "1" ]]; then
+    PROFILE_PATH="$(dirname "$inifile")/${profpath#*=}"
+  else
+    PROFILE_PATH="${profpath#*=}"
+  fi
+}
+
+getProfilePath () {
+  declare -r f1=~/Library/Application\ Support/Firefox/profiles.ini
+  declare -r f2=~/.mozilla/firefox/profiles.ini
+
+  if [ "$PROFILE_PATH" = false ]; then
+    PROFILE_PATH="$SCRIPT_DIR"
+  elif [ "$PROFILE_PATH" = 'list' ]; then
+    local ini=''
+    if [[ -f "$f1" ]]; then
+      ini="$f1"
+    elif [[ -f "$f2" ]]; then
+      ini="$f2"
+    else
+      echo -e "${RED}Error: Sorry, -l is not supported for your OS${NC}"
+      exit 1
+    fi
+    readIniFile "$ini" # updates PROFILE_PATH or exits on error
+  #else
+    # PROFILE_PATH already set by user with -p
+  fi
+}
+
+#########################
+#   Update updater.sh   #
+#########################
+
+# Returns the version number of a updater.sh file
+get_updater_version () {
+  echo $(sed -n '5 s/.*[[:blank:]]\([[:digit:]]*\.[[:digit:]]*\)/\1/p' "$1")
+}
+
+# Update updater.sh
+# Default: Check for update, if available, ask user if they want to execute it
+# Args:
+#   -d: New version will not be looked for and update will not occur
+#   -u: Check for update, if available, execute without asking
+update_updater () {
+  if [ $UPDATE = 'no' ]; then
+    return 0 # User signified not to check for updates
+  fi
+
+  declare -r tmpfile="$(download_file 'https://raw.githubusercontent.com/arkenfox/user.js/master/updater.sh')"
+  [ -z "${tmpfile}" ] && echo -e "${RED}Error! Could not download updater.sh${NC}" && return 1 # check if download failed
+
+  if [[ $(get_updater_version "${SCRIPT_DIR}/updater.sh") < $(get_updater_version "${tmpfile}") ]]; then
+    if [ $UPDATE = 'check' ]; then
+      echo -e "There is a newer version of updater.sh available. ${RED}Update and execute Y/N?${NC}"
+      read -p "" -n 1 -r
+      echo -e "\n\n"
+      [[ $REPLY =~ ^[Nn]$ ]] && return 0 # Update available, but user chooses not to update
+    fi
+  else
+    return 0 # No update available
+  fi
+  mv "${tmpfile}" "${SCRIPT_DIR}/updater.sh"
+  chmod u+x "${SCRIPT_DIR}/updater.sh"
+  "${SCRIPT_DIR}/updater.sh" "$@" -d
+  exit 0
+}
+
+
+#########################
+#    Update user.js     #
+#########################
+
+# Returns version number of a user.js file
+get_userjs_version () {
+  [ -e $1 ] && echo "$(sed -n '4p' "$1")" || echo "Not detected."
+}
+
+add_override () {
+  input=$1
+  if [ -f "$input" ]; then
+    echo "" >> user.js
+    cat "$input" >> user.js
+    echo -e "Status: ${GREEN}Override file appended:${NC} ${input}"
+  elif [ -d "$input" ]; then
+    SAVEIFS=$IFS
+    IFS=$'\n\b' # Set IFS
+    FILES="${input}"/*.js
+    for f in $FILES
+    do
+      add_override "$f"
+    done
+    IFS=$SAVEIFS # restore $IFS
+  else
+    echo -e "${ORANGE}Warning: Could not find override file:${NC} ${input}"
+  fi
+}
+
+remove_comments () { # expects 2 arguments: from-file and to-file
+  sed -e 's/^[[:space:]]*\/\/.*$//' -e '/^\/\*/,/\*\//d' -e '/^[[:space:]]*$/d' -e 's/);[[:space:]]*\/\/.*/);/' "$1" > "$2"
+}
+
+# Applies latest version of user.js and any custom overrides
+update_userjs () {
+  declare -r newfile="$(download_file 'https://raw.githubusercontent.com/arkenfox/user.js/master/user.js')"
+  [ -z "${newfile}" ] && echo -e "${RED}Error! Could not download user.js${NC}" && return 1 # check if download failed
+
+  echo -e "Please observe the following information:
+    Firefox profile:  ${ORANGE}$(pwd)${NC}
+    Available online: ${ORANGE}$(get_userjs_version $newfile)${NC}
+    Currently using:  ${ORANGE}$(get_userjs_version user.js)${NC}\n\n"
+
+  if [ $CONFIRM = 'yes' ]; then
+    echo -e "This script will update to the latest user.js file and append any custom configurations from user-overrides.js. ${RED}Continue Y/N? ${NC}"
+    read -p "" -n 1 -r
+    echo -e "\n"
+    if [[ $REPLY =~ ^[Nn]$ ]]; then
+      echo -e "${RED}Process aborted${NC}"
+      rm $newfile
+      return 1
+    fi
+  fi
+
+  # Copy a version of user.js to diffs folder for later comparison
+  if [ "$COMPARE" = true ]; then
+    mkdir -p userjs_diffs
+    cp user.js userjs_diffs/past_user.js &>/dev/null
+  fi
+
+  # backup user.js
+  mkdir -p userjs_backups
+  local bakname="userjs_backups/user.js.backup.$(date +"%Y-%m-%d_%H%M")"
+  [ $BACKUP = 'single' ] && bakname='userjs_backups/user.js.backup'
+  cp user.js "$bakname" &>/dev/null
+
+  mv "${newfile}" user.js
+  echo -e "Status: ${GREEN}user.js has been backed up and replaced with the latest version!${NC}"
+
+  if [ "$ESR" = true ]; then
+    sed -e 's/\/\* \(ESR[0-9]\{2,\}\.x still uses all.*\)/\/\/ \1/' user.js > user.js.tmp && mv user.js.tmp user.js
+    echo -e "Status: ${GREEN}ESR related preferences have been activated!${NC}"
+  fi
+
+  # apply overrides
+  if [ "$SKIPOVERRIDE" = false ]; then
+    while IFS=',' read -ra FILES; do
+      for FILE in "${FILES[@]}"; do
+        add_override "$FILE"
+      done
+    done <<< "$OVERRIDE"
+  fi
+
+  # create diff
+  if [ "$COMPARE" = true ]; then
+    pastuserjs='userjs_diffs/past_user.js'
+    past_nocomments='userjs_diffs/past_userjs.txt'
+    current_nocomments='userjs_diffs/current_userjs.txt'
+
+    remove_comments $pastuserjs $past_nocomments
+    remove_comments user.js $current_nocomments
+
+    diffname="userjs_diffs/diff_$(date +"%Y-%m-%d_%H%M").txt"
+    diff=$(diff -w -B -U 0 $past_nocomments $current_nocomments)
+    if [ ! -z "$diff" ]; then
+      echo "$diff" > "$diffname"
+      echo -e "Status: ${GREEN}A diff file was created:${NC} ${PWD}/${diffname}"
+    else
+      echo -e "Warning: ${ORANGE}Your new user.js file appears to be identical.  No diff file was created.${NC}"
+      [ $BACKUP = 'multiple' ] && rm $bakname &>/dev/null
+    fi
+    rm $past_nocomments $current_nocomments $pastuserjs &>/dev/null
+  fi
+
+  [ "$VIEW" = true ] && open_file "${PWD}/user.js"
+}
+
+#########################
+#        Execute        #
+#########################
+
+if [ $# != 0 ]; then
+  # Display usage if first argument is -help or --help
+  if [ $1 = '--help' ] || [ $1 = '-help' ]; then
+    usage
+  else
+    while getopts ":hp:ludsno:bcvre" opt; do
+      case $opt in
+        h)
+          usage
+          ;;
+        p)
+          PROFILE_PATH=${OPTARG}
+          ;;
+        l)
+          PROFILE_PATH='list'
+          ;;
+        u)
+          UPDATE='yes'
+          ;;
+        d)
+          UPDATE='no'
+          ;;
+        s)
+          CONFIRM='no'
+          ;;
+        n)
+          SKIPOVERRIDE=true
+          ;;
+        o)
+          OVERRIDE=${OPTARG}
+          ;;
+        b)
+          BACKUP='single'
+          ;;
+        c)
+          COMPARE=true
+          ;;
+        v)
+          VIEW=true
+          ;;
+        e)
+          ESR=true
+          ;;
+        r)
+          tfile="$(download_file 'https://raw.githubusercontent.com/arkenfox/user.js/master/user.js')"
+          [ -z "${tfile}" ] && echo -e "${RED}Error! Could not download user.js${NC}" && exit 1 # check if download failed
+          mv $tfile "${tfile}.js"
+          echo -e "${ORANGE}Warning: user.js was saved to temporary file ${tfile}.js${NC}"
+          open_file "${tfile}.js"
+          exit 0
+          ;;
+        \?)
+          echo -e "${RED}\n Error! Invalid option: -$OPTARG${NC}" >&2
+          usage
+          ;;
+        :)
+          echo -e "${RED}Error! Option -$OPTARG requires an argument.${NC}" >&2
+          exit 2
+          ;;
+      esac
+    done
+  fi
+fi
+
+show_banner
+update_updater $@
+
+getProfilePath # updates PROFILE_PATH or exits on error
+cd "$PROFILE_PATH" && update_userjs
+
+cd "$CURRDIR"

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