Created 3.2 Overrides [Common] (markdown)

3.2-Overrides-[Common].md

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+🟩 Previous: [Overrides](https://github.com/arkenfox/user.js/wiki/3.1-Overrides)
+
+🟥 Summary: **These few items, out of 140+ pref changes, will solve 99% of usability issues and you only need to do it once**. You can always undo things (except deleted items like cookies and history and session restore: read the entire page!), and tweak over time
+
+---
+
+🟪 SECURITY: IMPORTANT: Pay attention!
+
+- `0403`: We disable binary checks not in Safe Browsing local lists
+   - :warning: If you do not understand the consequences of this, override these prefs
+
+🟪 KEEP SOME COOKIES & LOGINS: Nothing to change
+
+- We delete all cookies and site data on close
+   - There is no need to change any prefs - just add site exceptions
+      - Ctrl+I > Permissions > Cookies > Allow
+      - Options > Privacy & Security > Permissions > Settings
+      - For cross-domain logins you will need to add exceptions for both sites
+
+🟪 COMMON: Change to suit
+
+- `0102`: We disable session restore
+   - If you rely on session restore you had better change this, see our [override recipe](https://github.com/arkenfox/user.js/issues/1080)
+- `0801`: We disable automatic search from the urlbar
+   - You can still use search buttons and keyword shortcuts. If you change to a privacy respecting search engine and trust them, override this
+- `0811`: We disable search & form history
+   - Form data can easily be stolen by third parties
+     - see this 2017 [article](https://freedom-to-tinker.com/2017/12/27/no-boundaries-for-user-identities-web-trackers-exploit-browser-login-managers/) and these [bugzillas](https://bugzilla.mozilla.org/buglist.cgi?bug_id=1443083,1427543)
+     - see this 2011 [article](https://blog.mindedsecurity.com/2011/10/autocompleteagain.html) and this [bugzilla](https://bugzilla.mozilla.org/381681)
+- `1223`: We enforce strict pinning
+   - If you have issues with antivirus
+- `1601`: We hardened cross origin referers  🥇 `#1 ISSUE`
+   - This may cause breakage where third party images and videos may not load
+   - If `1601` is too strict for you, override it to default `0` and consider using Smart Referer in Strict mode
+- `2022`: We disable DRM
+   - If you use Netflix, Hulu, Amazon Prime etc ... or consider watching those in a secondary browser
+- `2811`: We delete history (download, form and browsing histories) on close
+   - Override `2811` (and `2812` for manual sanitizing) if you want
+- `4520` We disable WebGL
+   - If you want it, override it
+
+🟪 FINGERPRINTING
+
+- `4501`: We enable RFP and `4504`: letterboxing
+   - letterboxing is independent of `4501` and is the pref that creates borders around your webpages
+
+Read the next wiki page to decide if you want to keep using these or instead perhaps use Canvas Blocker
+
+🟪 OTHER
+
+Other preferences may cause site breakage, but nothing that can't be fixed. You won't "lose" anything...- it's not the end of the world.
+
+- Check our [override recipes](https://github.com/arkenfox/user.js/issues/1080)
+- Check already [answered](https://github.com/arkenfox/user.js/issues?q=is%3Aissue+label%3Aanswered) issues
+- While not 100% definitive, search for `[SETUP` in the user.js; e.g.
+   * `[SETUP-WEB]` can cause some websites to break
+   * `[SETUP-CHROME]` changes how Firefox itself behaves (i.e. NOT directly website related)
+- You may also want to add items e.g.
+   - `5000s` optional
+   - `9000s` personal
+
+---
+
+🟩 Next: [Overrides [To RFP or Not]](https://github.com/arkenfox/user.js/wiki/3.3-Overrides-[To-RFP-or-Not])