Firefox allows the user to create a userContent.css file that it loads for every page. The trick, however, is that you write CSS queries that only act on certain domains/websites/webpages to redesign it at will. Think of it like going into the Developer Options and changing some CSS rules, but this way, they stick every time you browse to that webpage again.

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Navigate to /usr/lib/firefox and create autoconfig.cfg and defaults/pref/autoconfig.js.

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