Make firefox look like this?
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You need first find out how do you want to style the website. You can use the devtools menu for that (
F12
). Then you need to create auserContent.css
, and write your css there. I recommend writing your rules for given urls or url-prefixes like@-moz-document url-prefix(www.4chan.org){body{background: #111}}
or@-moz-document url("www.4chan.org"){body{background: #111}}
so it only has an effect on the websites you want to style.