There are three possibilities.Make sure FireFox is fully updatedFrom the menu at the top of the browser goto Help > Check for updatesMake sure you have all the essential media codec's:http://download.cnet.com/Windows-Essentials-Media-Codec-Pack/3000-2140_4-10662709.htmlEnsure that you have updated both Flash and Quicktime Playerhttp://get.adobe.com/flashplayer/?promoid=BUIGPhttp://www.apple.com/quicktime/download/If all else fails:Uninstall Firefox and Re-install with a newly downloaded installer file at the Firefox site.If this information has been helpful, please rate. If not please let us know.
Try rolling back to an earlier version of Macromedia Shockwave Flash (No earlier then ver 8) since youtube uses swf and sometimes the plugin causes issues with mozilla (based loosly on gecko) -Canis
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Answers & Comments
There are three possibilities.
Make sure FireFox is fully updated
From the menu at the top of the browser goto Help > Check for updates
Make sure you have all the essential media codec's:
http://download.cnet.com/Windows-Essentials-Media-Codec-Pack/3000-2140_4-10662709.html
Ensure that you have updated both Flash and Quicktime Player
http://get.adobe.com/flashplayer/?promoid=BUIGP
http://www.apple.com/quicktime/download/
If all else fails:
Uninstall Firefox and Re-install with a newly downloaded installer file at the Firefox site.
If this information has been helpful, please rate. If not please let us know.
Try rolling back to an earlier version of Macromedia Shockwave Flash (No earlier then ver 8) since youtube uses swf and sometimes the plugin causes issues with mozilla (based loosly on gecko)
-Canis