Firefox will not open after being installed
Recently I was having problems in installing add-ons to firefox. So I uninstalled firefox and have reinstalled it. However now when I click on firefox I get a message saying 'close firefox. A copy of firefox is already open. Only one copy of firefox can be open at a time'. Any suggestions on how to fix this please. Thanks
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Hi, This problem happens when firefox has not completely shut down and remains in memory. Either restart the computer or stop the firefox processes running.
For more information see the "Hang at exit" section of Firefox hangs or is not responding - How to fix
If you are still having some trouble with your add-ons, perhaps this section could be of use: Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems As detailed in the write up, you can try firefox safe mode and see if the problem still occurs.
Hope this helps