With firefox not running, I cannot upgrade as my computer thinks it is still running. Firefox.exe does not appear in the task manager.
I seem to be able to start Firefox only once after I reboot my computer. After that it will not start. I tried upgrading the software using Internet Explorer to get the upgrade file. The installation failed when the computer said I needed to close Firefox to install the upgrade. The task manager didn't show firefox on the list as one of the processes and it wasn't running anywhere on my machine.
after I installed Skype
User Agent
Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)
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Try the other solutions at https://support.mozilla.com/en-US/kb/Firefox+is+already+running+but+is+not+responding
After starting using and shutting down Firefox, it will not let you start it up again. You get message that Firefox is still running and computer must be restarted losing what has been started , etc..
Jim Harris:
Hanging at exit is most frequently caused by an Extension or a Plugin.
Kill Application In Task Manager, does firefox.exe show in the Processes tab? See: Kill Application
Causes and solutions for Firefox hanging at exit: Firefox hangs or is not responding - How to fix Firefox hangs at exit "Firefox is already running but is not responding" error - How to fix
Safe Mode You may need to use Diagnose Firefox issues using Troubleshoot Mode (click on "Safe Mode" and read) to localize the problem. Firefox Safe Mode is a diagnostic mode that disables Extensions and some other features of Firefox. If you are using a theme, switch to the DEFAULT theme: Tools > Add-ons > Themes before starting Safe Mode. When entering Safe Mode, do not check any items on the entry window, just click "Continue in Safe Mode". Test to see if the problem you are experiencing is corrected.
See: Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems Troubleshoot issues with plugins like Flash or Java to fix common Firefox problems Troubleshoot and diagnose Firefox problems
If the problem does not occur in Safe-mode then disable all of your Extensions and Plug-ins and then try to find which is causing it by enabling one at a time until the problem reappears. You MUST close and restart Firefox after EACH change via File > Restart Firefox (on Mac: Firefox > Quit). You can use "Disable all add-ons" on the Safe mode start window.