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Video won't play in firefox

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I've downloaded the latest versions of firefox and flash, but can't watch youtube or any other online video. Youtube gives an error message. It used to just play automatically, but now I have to click the play button, then error appears. I've also update quicktime and realplayer recently as well. I can watch with IE9 no problem and I don't know what the problem is. Any help is appreciated!

I've downloaded the latest versions of firefox and flash, but can't watch youtube or any other online video. Youtube gives an error message. It used to just play automatically, but now I have to click the play button, then error appears. I've also update quicktime and realplayer recently as well. I can watch with IE9 no problem and I don't know what the problem is. Any help is appreciated!

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If you can't get Flash 11.3 to work and need to revert to Flash 11.2 then you can download the Flash 11.2 player via this direct link:

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The latest version of Flash has problems with some configurations of Firefox. Does anything in this article help: Flash 11.3 doesn't load video in Firefox?

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If you can't get Flash 11.3 to work and need to revert to Flash 11.2 then you can download the Flash 11.2 player via this direct link:

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Very helpful! Thank you both! I've uninstalled 11.3 and reinstalled 11.2 and eveything works great. You're awesome!