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Sometimes when I close a tab with a flash video on it, the video (it's sound) keeps playing in the background (and I can't close it), why is that?

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At first I came close to this problem, when I closed Firefox with the Close button, but the Windows Task Manager showed its task is on. Then again I opened some links from Windows Live Messenger and when the Firefox browser popped out there was a video playing and I closed its tab on the half video, its sound just kept going, and I couldnt stop it from running. But now I have this problem even when killing a task, one really annoyin sound from some stupid flash video just plays in the background everytime I open Firefox (even if the task is killed, just every single time it runs up, it even occured after I updated Firefox to the newest version available). WHAT SHOULD I DO?!

At first I came close to this problem, when I closed Firefox with the Close button, but the Windows Task Manager showed its task is on. Then again I opened some links from Windows Live Messenger and when the Firefox browser popped out there was a video playing and I closed its tab on the half video, its sound just kept going, and I couldnt stop it from running. But now I have this problem even when killing a task, one really annoyin sound from some stupid flash video just plays in the background everytime I open Firefox (even if the task is killed, just every single time it runs up, it even occured after I updated Firefox to the newest version available). WHAT SHOULD I DO?!

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Sounds that the plugin-container process isn't closing properly.
See http://kb.mozillazine.org/Plugin-container_and_out-of-process_plugins


There are other things that need attention.
You have a corrupted Firefox 3.6.13 user agent: Firefox/2.0.0.14;MEGAUPLOAD 1.0

See: