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Undoubtedly someone out there are having similar issue. Google search for “Firefox is already running“ return more than 49,000,000 page results! (49 millions) and most of the pages happen to be published after Firefox 3 release (June 2008). So you can make some clever assumptions that this particular issue might related to Mozilla Firefox 3.
Google search results page
The below image is the said error message that sums up the 49 millions search results.
Firefox not respondingFirefox is already running, but is not responding. To open a new window, you must first close the existing Firefox process, or restart your system.
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megaupload
This greasemonkey userscript is base on my previous 
