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Firefox has these weird characters on sites like justin.tv, etc.

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How can I fix this? Some pictures: http://gyazo.com/d0aef73f052e296f2936a2b03e509392.png http://gyazo.com/b314ef38a094bd15bf8d0e0049924616.png http://gyazo.com/9e953198ecb9fc6f4e21596fe766d647.png

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locked as a duplicate of this thread https://support.mozilla.com/en-US/questions/751829