diff --git a/Appendix-B:-Firefox-Add-ons.md b/Appendix-B:-Firefox-Add-ons.md
index 0f33bc9..2d57083 100644
--- a/Appendix-B:-Firefox-Add-ons.md
+++ b/Appendix-B:-Firefox-Add-ons.md
@@ -9,7 +9,7 @@ If you would like to submit a privacy or security related add-on (it *must* be e
 ### :small_orange_diamond: Recommended Add-ons
 These are all, where applicable, best configured to `deny-all` and whitelist.
 
-:pushpin: Not e10s compatible:
+:pushpin: Not e10s compatible
 :white_check_mark: WebExtension
 
 * [NoScript](https://addons.mozilla.org/en-US/firefox/addon/noscript/)
@@ -18,6 +18,8 @@ These are all, where applicable, best configured to `deny-all` and whitelist.
 * [uMatrix](https://addons.mozilla.org/en-US/firefox/addon/umatrix/)
 * [Cookie Controller](https://addons.mozilla.org/en-US/firefox/addon/cookie-controller/) <sup>1</sup>
 * [Self-Destructing Cookies](https://addons.mozilla.org/en-US/firefox/addon/self-destructing-cookies/) <sup>1</sup>
+* [Smart Referer](https://addons.mozilla.org/en-US/firefox/addon/smart-referer/) :pushpin:
+  * Will be disabled by FF53 (`multiprocessCompatible` flag is missing)
 * [HTTPS Everywhere](https://addons.mozilla.org/en-US/firefox/addon/https-everywhere/)
 * [CanvasBlocker](https://addons.mozilla.org/en-US/firefox/addon/canvasblocker/)
 * [No Resource URI Leak](https://addons.mozilla.org/en-US/firefox/addon/no-resource-uri-leak/)
@@ -25,7 +27,8 @@ These are all, where applicable, best configured to `deny-all` and whitelist.
 * [Greasemonkey](https://addons.mozilla.org/en-Us/firefox/addon/greasemonkey/)
   * Allows you to run [User Scripts](https://github.com/ghacksuserjs/ghacks-user.js/wiki/3.1-User-Scripts) which can do neat things
 * [NoRedirect](https://addons.mozilla.org/en-US/firefox/addon/noredirect/) :pushpin: 
-  * Will be disabled by FF53. Use [this](https://addons.mozilla.org/en-US/firefox/addon/noredirect-clone/) patched version, which will last until e10s is enforced
+  * Will be disabled by FF53 (`multiprocessCompatible` flag is missing)
+  * Use [this](https://addons.mozilla.org/en-US/firefox/addon/noredirect-clone/) patched version, which will last until e10s is enforced
 * [UAControl](https://addons.mozilla.org/en-US/firefox/addon/uacontrol/) <sup>2</sup> :pushpin: 
 * [User-Agent JS Fixer](https://addons.mozilla.org/en-US/firefox/addon/user-agent-js-fixer/) <sup>2</sup> :pushpin: 
 * [Pure URL](https://addons.mozilla.org/en-US/firefox/addon/pure-url/)