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Old post but it looks like its there: (Warning, Bad Place ahead)
https://www.reddit.com/r/LibreWolf/comments/u0hx0t/customization_with_css/Yup I’ve been using Firefox-UI-Fix for a long time now.
Used it back on Firefox and it worked fine when I switched to Librewolf.
Yes. Firefox has yet to kill userChrome.css and the Librewolf devs didn’t disable it.