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UserChrome still working. You could try mine https://github.com/benyaminl/firefox-proton-compact
I still love floating Tab so I let it be. And nowdays I use Cascade UserChrome
Mozilla censored my entire post. Go figure. That about sums up the Mozilla Foundation’s disregard for its users.
Your post is hidden, but readable if someone unhides it. Must have been reported for some reason by someone, but probably only a moderator could tell you why if you didn’t get any kind of notification.
Regarding the menu spacing, Firefox 92 changed the style of the Bookmarks Toolbar folder drop-downs, so an extra rule is needed for reducing the padding:
I switched to Waterfox. Everything seems fine now, so far.