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When use gmail all tabs are freezed, key stroke or mouse click response is super slow

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When point the mouse at any contacts on google chat in gmail page, all tabs and UIs in the firefox-3.6.22-32bit stop to response any more. It will freeze about 30 sec. One of the 4 cores in CPU will be occupied 100%. In the google search page, the response to keystrokes is also much slower than before.

When point the mouse at any contacts on google chat in gmail page, all tabs and UIs in the firefox-3.6.22-32bit stop to response any more. It will freeze about 30 sec. One of the 4 cores in CPU will be occupied 100%. In the google search page, the response to keystrokes is also much slower than before.

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I finally spotted the problem. It is the extension: Download Youtube Videos+ 3.42. Once I disable this plugin, Firefox behaves normally.