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I am running Firefox 27.0 and sometimes it shows strange symbols instead of icons.

For example, instead of arrows up/down for up voting or down voting in a forum, it show some Japanese looking character.

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Have you got NoScript installed, or any similar addon that may block custom fonts? If so, you will have to allow them using the addon's menu, if possible. – Michael Ehrenreich May 11 '14 at 13:10
Yes, I have NoScript, I'll check its settings. – Quora Feans May 11 '14 at 13:13
Done, NoScript > Options > Embeddings > Forbid @font-faces (unmarked). I hope I haven't just open the door for evil fonts to my system. – Quora Feans May 11 '14 at 13:20
Ok, did that solve the problem? An alternative to allowing fonts on all sites would be to either allow scripts for that site or if scripts are already allowed, to allow the specific font under "Blocked Objects". – Michael Ehrenreich May 11 '14 at 13:29
Nope, allowing fonts for all works better for me, since the problem arises in many sites. – Quora Feans May 11 '14 at 13:37

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