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Firefox won't let me upload files on uploading sites.

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Anytime I try to upload pictures or videos to mediafire, megaupload, or photobucket, I get error messages.

URL of affected sites

http://

Anytime I try to upload pictures or videos to mediafire, megaupload, or photobucket, I get error messages. == URL of affected sites == http://

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What did those error messages say?