Firefox is not opening and saying " firefox is alredy running but not responding ,to open a new window you must close the existing fireox process" even though there is no other window open

Question

this has been happening since i updated i have windows 7 but firefox beta used to work just 3 days ago i had mcafee site advisor but i deleted it its not working every time i click on the icon it displays the above message

Answer 1

I discovered that when the "Firefox is already running . . . ." message pops up I can fix it by doing the following [note: I get the same message for the Thunderbird e-mail program too] : 1. I open 'TASK MANAGER" and click on the "Processes" tab. 2. Next I scroll down until I see Firefox.exe *32 in the leftmost column (or Thunderbird. exe *32 if the message came up there), highlight that line by clicking on it and then click on the "end process" button on the right side on the bottom. 4. A pop-up window will come up but ignore its message and click on the "end process" button in the pop-up window. The program should then start the next time you click on the icon..
While that saves the need to restart your PC to fix the problem, I have yet to find any information as to the reasons for those two processes to show up in the first place. I'm running the 64 bit Win 7 Professional and do not know if that has something to do with those two processes running from time to time or not. The message comes up often but not all the time and I haven't been able to pinpoint any action on my part where the message comes up if I do '''X '''or the message never comes up when I do '''Y''' before closing Firefox or Thunderbird.