Firefox won't open, keeps telling me that it is already running
I have tried everything in the trouble shooter and none of it worked. In the profile folder I would uncheck the read only box, close it and reopen it and it would be checked again.
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Did you check the Processes tab in the Windows Task Manager for hanging Firefox or plugin-container processes?
See also:
- http://kb.mozillazine.org/Profile_in_use
- https://support.mozilla.org/kb/Firefox+is+already+running+but+is+not+responding
Try to use "Firefox > Exit" (Windows: Firefox/File > Exit; Mac: Firefox > Quit Firefox; Linux: Firefox/File > Quit) to close Firefox if you are currently doing that by clicking the close X on the Firefox title bar.
Are you using "Clear history when Firefox closes" to clear any personal data?
- Tools > Options > Privacy > Firefox will: "Use custom settings for history": "Clear history when Firefox closes" > Settings
- https://support.mozilla.org/kb/remove-recent-browsing-search-and-download-history
Do you have the Firefox icon on your quick launch? Right click on it, and select Open New Window. Sometimes this works. If it opens, close it by Menu > File > Exit.
This is not a cure but will make it easier if Firefox locks up in Windows. https://support.mozilla.org/questions/997866 {web link}
When I open the task manager firefox isn't listed, and yes its on my taskbar but doesn't give me the option to open a new tab. The only 2 options it gives me is to open firefox and unpin from task bar.