Set extensions.htmlaboutaddons.recommendations.enabled -> false

Author: pyllyukko

README.md

@@ -250,7 +250,7 @@ Harden preferences related to external plugins
 ### Firefox (anti-)features / components
 
 Disable Firefox integrated metrics/reporting/experiments, disable potentially insecure/invasive/[undesirable](https://en.wikipedia.org/wiki/Feature_creep) features
-* Disable Extension recommendations (Firefox >= 65) [ [1](https://support.mozilla.org/en-US/kb/extension-recommendations) ]
+* Disable Extension recommendations (Firefox >= 65) [ [1](https://support.mozilla.org/en-US/kb/extension-recommendations) [2](https://brokkr.net/2025/08/10/firefox-aboutconfig-tricks-3-dont-recommend-extensions/) ]
 * Disable WebIDE [ [1](https://trac.torproject.org/projects/tor/ticket/16222) [2](https://developer.mozilla.org/docs/Tools/WebIDE) ]
 * Disable remote debugging [ [1](https://developer.mozilla.org/docs/Tools/Remote_Debugging/Debugging_Firefox_Desktop) [2](https://developer.mozilla.org/docs/Tools/Tools_Toolbox#Advanced_settings) ]
 * Disable Mozilla telemetry/experiments [ [1](https://wiki.mozilla.org/Platform/Features/Telemetry) [2](https://wiki.mozilla.org/Privacy/Reviews/Telemetry) [3](https://wiki.mozilla.org/Telemetry) [4](https://www.mozilla.org/en-US/legal/privacy/firefox.html#telemetry) [5](https://support.mozilla.org/t5/Firefox-crashes/Mozilla-Crash-Reporter/ta-p/1715) [6](https://wiki.mozilla.org/Security/Reviews/Firefox6/ReviewNotes/telemetry) [7](https://gecko.readthedocs.io/en/latest/browser/experiments/experiments/manifest.html) [8](https://wiki.mozilla.org/Telemetry/Experiments) [9](https://support.mozilla.org/en-US/questions/1197144) [10](https://firefox-source-docs.mozilla.org/toolkit/components/telemetry/telemetry/internals/preferences.html#id1) ]

user.js

@@ -454,7 +454,9 @@ user_pref("extensions.systemAddon.update.enabled",		false);
 
 // PREF: Disable Extension recommendations (Firefox >= 65)
 // https://support.mozilla.org/en-US/kb/extension-recommendations
+// https://brokkr.net/2025/08/10/firefox-aboutconfig-tricks-3-dont-recommend-extensions/
 user_pref("browser.newtabpage.activity-stream.asrouter.userprefs.cfr",	false);
+user_pref("extensions.htmlaboutaddons.recommendations.enabled",		false);
 
 // PREF: Trusted Recursive Resolver (DNS-over-HTTPS) (disabled)
 // https://wiki.mozilla.org/Trusted_Recursive_Resolver