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flash player plays when video fully buffered

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Hello there, I'm having problems with the flash player on firefox. Every flash video that I want to watch only plays after it's fully buffered, it won't even show the buffering bar at all. On IE and Chrome it works fine.

Hello there, I'm having problems with the flash player on firefox. Every flash video that I want to watch only plays after it's fully buffered, it won't even show the buffering bar at all. On IE and Chrome it works fine.

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Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of the extensions or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).

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I've tried both of those thing and nothing worked, still the same. I've tried reinstalling adobe flash player, firefox and all video codecs. Still the same. Is there a way to reinstall firefox without losing all bookmarks and setting? thanks for your reply.