Hide MV3 Extensions button?

[Darthagnon]

Firefox 109 followed Chromium 87 in adding an unsightly extensions button to the toolbar to manage MV3 extensions. For a while, the solution to hiding it was about:config >> extensions.unifiedExtensions.enabled >> false, then the solution was userChrome.css >> #unified-extensions-button {display:none!important;}. This is a workaround, though the pre-Firefox 109 extension management was vastly superior. Please can this be added back to r3dfox?

There are some upcoming improvements to Firefox that make the extensions button hideable again.

EDIT: I used userchrome to hide the extensions menu button, but extension icons cannot be pinned to the overflow menu or the hamburger menu 😭 See also this discussion