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Thank you. With just the fix to connect the "button" to the tab below, it feels good again. The other interface with the floating buttons is a bit too unspatial for me (I always had a thing for spatial interfaces).

It would be pretty cool if someone could create a package management-like tool where I could easily browse and install these little customizations…

Perhaps an extension or plugin of some sort... maybe call them add ons? ;-)

Yeah, except the "new"-style Firefox addons can't do half the things ye Olde ones could.

Would userChrome.css get overwritten with each update?

No, but your changes may break in a future update