Knowledge Base

Starting in Firefox 109.0, we could use a line in the prefs.js (or about:config) to remove the annoying puzzle piece.

user_pref("extensions.unifiedExtensions.enable", false);

However, starting in Firefox 111.0 the Mozilla people started ignoring this pref. The brilliant folks over at askvg.com solved this one though!

You have take a few steps for this solution.

1. Set about:config value toolkit.legacyUserProfileCustomizations.stylesheets to true.
2. Visit the profile directory (available from about:support, button "Open Directory") and make sub-directory chrome.
3. Make file chrome/userChrome.css with contents:

#unified-extensions-button, #unified-extensions-button > .toolbarbutton-icon{
width: 0px !important;
padding: 0px !important;
}

1. Restart Firefox.

I don't plan on ever using Chrome, but wow, the Mozilla people make me want to look for something else.

This is the first time I've ever needed to modify userChrome.css. Ever since 2006, I have never needed it!