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How to permanently add CSS to some pages using Firefox?

Say, I want to change the font or background of a page I frequent using Firefox.

How to do that?

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2 Answers 2

up vote 4 down vote accepted

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Greasemonkey is a good option.. –  aneeshep Mar 14 '11 at 13:29

There's a great extension called Stylish that does exactly what you're looking for. It allows you to add custom CSS to the pages you visit.

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