Firefox 9.0.1 keeps hanging once I access a website with video, when I write e-mails etc. If a press ctrl+alt+del, opens a window to confirm closing, and firefox works again. When I close that confirm window, firefox immediately hangs again.

It stops working if I access websites with videos, and all sort of more complex flash. It I try to write an e-mail, it also stops. I can't do anything. PC keeps working, though. So I press ctrl+alt+del. It opens that window asking if you want to close all the tabs. I notice that firefox start to work again, behind that window. But, once I close the window, it stops again. Sometimes I can close the tab with the video before it hangs again, which can take a few ctr+alt+del's. It doesn't happen with other browsers! It started 1 week ago. Is it an extension? Or a virus (i use avast)? Thank you!

Perform the suggestions mentioned in the following articles:
* [https://support.mozilla.com/en-US/kb/Template:clearCookiesCache/ Clear Cookies & Cache]
* [[Troubleshooting extensions and themes]]
* [[Managing the Flash plugin]]
Check and tell if its working.

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