Stylish

Stylish

Free
Installs skins for a wide variety of websites
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Changes the way YouTube, Facebook, Google, Tumblr or other websites look in your browser by installing skins for them. Modifies Firefox's and other applications' appearances.

Restyle the web with Stylish, a user styles manager.
Stylish lets you easily install themes and skins for Google, Facebook, YouTube, Orkut, and many, many other sites.
You can even customize Firefox and other programs themselves.
You can even use user styles as themes on the interface of Firefox, Thunderbird, and SeaMonkey themselves.

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