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Set
toolkit.legacyUserProfileCustomizations.stylesheets
in about:config totrue
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Go to about:support to find out where your profile directory is located, e.g.
~/.mozilla/firefox/n2sdfb6i.default/
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Inside that directory create a directory called
chrome
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Inside
chrome
create a file calleduserContent.css
with the following contents:/* Make sure that PAGEDOWN always scrolls a full screen down */ body { margin-bottom: 91vh !important; } /* Applies only to example.com */ @-moz-document domain(example.com) { div { color: white !important; background-color: black !important; } }
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Reload Firefox
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