this post was submitted on 07 Aug 2023
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you can style firefox with arbitrary css code!
userChrome.css (+also userContent.css, user.js if you need them)
just enable
toolkit.legacyUserProfileCustomizations.stylesheets
in theabout:config
pagethen open your Firefox profile folder, create a folder called "chrome" and create two files: userChrome.css and userContent.css
you can style browser window elements using the userChrome.css
userContent.css applies to all pages, including your firefox home page which is usually impossible to style eith extensions for security purposes (use
-moz-*
queries to restrict to certain pages)You can find your Firefox profile folder at
about:profiles
.