How can I override the CSS of a site in Firefox with userContent.css?

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Chapters
00:00 Question
00:26 Accepted answer (Score 168)
01:37 Answer 2 (Score 8)
02:05 Thank you

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Full question
https://superuser.com/questions/318912/h...

Accepted answer links:
[the name ]: http://kb.mozillazine.org/UserContent.cs...

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Tags
#firefox #css

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