When I click the button below, the video player doesn't expand. I am using Firefox 8.0.1 Windows 7 64-bit. Any ideas how to fix it?

enter image description here

Note: I do not experience this problem in my other browsers like Safari and IE.

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Have you tried disabling your plugins to see if one of them is causing it? – SaintWacko Dec 15 '11 at 21:35
I tried disabling all plugins/add-ons then re-enabling, it worked for a while but problem came back next day. – IMB Dec 17 '11 at 17:23
Do you have any plugins that affect youtube? – SaintWacko Dec 18 '11 at 3:22
none directly related to youtube. – IMB Dec 18 '11 at 10:13
here are my current: plugins/extensions: i.imgur.com/IOQGI.png Note: It's working fine again now, I didn't do anything but I'm sure it will come back soon :-) – IMB Dec 18 '11 at 10:21
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The solution is to clear your cookies from Youtube.com

http://www.google.com/support/forum/p/youtube/thread?tid=2ea00da96a8a3882&hl=en

If you got it working, most likely you cleared your history and cookies or they got reset. Deleting the cookies from Youtube.com fixed the problem for me.

I recently used the Firefox add-on FEBE to restore all my settings/passwords/addons from a previous install of Windows (upgraded some hardware). I believe there was some issue with restoring the cookies from a previous build.

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I tried clearing cookies and it worked! Thanks – IMB Dec 22 '11 at 11:42
Hmm.. Well apparently it keeps coming back. I already cleared cookies twice. Worked for a while then problem's back. Even if I don't do anything just watch videos it comes back after a while. – IMB Dec 22 '11 at 13:59
What addons and plugins do you have installed? – Jack Dec 22 '11 at 22:34
These: i.imgur.com/IOQGI.png – IMB Dec 23 '11 at 9:00
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