Firefox crashs when visiting any page with flash content, how I can I stop that?

HI all,
Any page I visit with a flash video of some sort causes firefox to lockup, youtube is just the most prevalent. The page loads, then the program compatibility assistant pops up. I can't download,cancel or close out of that window and I have to ctrl-alt-delete and shut down the plug in container manually to be able to continue surfing. I have tried all three options on the firefox support page, tried using both 3.6.6 and 4.0 Beta 1, updating flash, no joy on any of those attempts.
I can play videos using VLC normally and the video that starts up when I visited the 4.0 beta welcome page works fine if that helps any.
Can anyone help?
== URL of affected sites ==
http://www.youtube.com

If you close Firefox, then start Firefox in Safe Mode, does the problem still occur? For instructions on starting in Safe Mode, see [[Safe Mode]]. Or you can try creating a new profile. Your Firefox settings and info are kept in a folder separate from the Firefox program, called your profile folder. Try creating a test profile, to see if the problem still occurs. See [[Managing profiles]]. Also it can be a extension or plugin causing the problem. Extensions can sometimes be the cause of problems. If the problem does not occur in Safe Mode, then you can disable your extensions one-by-one until you find out which one is causing the problem. See [[Troubleshooting extensions and themes]]

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