Basically, whenever I edit firefox-profile-path/chrome/userChrome.css, I want firefox to automatically apply the file again. The only posts I found on this are old and not straightforward. I’m wondering what currently works.
As far as I know, that’s not possible. I don’t think there has been any change to this, as Mozilla considers userChrome.css a deprecated feature (though they don’t plan on removing it).
That’s both disheartening and good to know. IMHO FF wastes too much vertical and horizontal space in the bars at the top of the page. I always liked being able to shrink those down, hopefully they will continue to support it
The only way I know of, is to restart Firefox. If you’re concerned whether or not FF is picking up your changes (I always forget which profile directory is being read (AppData vs Local) on windows) you could try something like this:
/*** uncomment below to verify userChrome.css is being read by turning the taskbar red /
/ #nav-bar{ background: #f00 !important } ***/Just uncomment the 2nd line, restart FF with your changes, and comment it out once you’re done

