How do I get sound back for YouTube?

Ever since I downloaded firefox 4.0 beta 3 I have no sound for YouTube videos.

You have a corrupted user agent:
''Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1.8) Gecko/20100202 Firefox/3.0.8;MEGAUPLOAD 1.0 (.NET CLR 3.5.30729)''
You have or had an extension installed (MegaUpload toolbar) that has changed the user agent to Firefox/3.0.8.
You can check the general.useragent prefs on the about:config page.<br />
You can open the about:config page via the location bar, just like you open a website.<br />
Filter: general.useragent<br />
If general.useragent prefs are bold (user set) then you can right-click that pref and choose Reset.<br />
See [[Web sites or add-ons incorrectly report incompatible browser]] and [[Finding your Firefox version]]
See also http://kb.mozillazine.org/Resetting_your_useragent_string_to_its_compiled-in_default
Clear the Flash cookies and settings.
Flash Website Storage Settings panel:
http://www.macromedia.com/support/documentation/en/flashplayer/help/settings_manager07.html
See also Flash Local storage settings
http://www.macromedia.com/support/documentation/en/flashplayer/help/help02.html

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