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on windows 10. started my laptop and opened firefox without problem. then windows crashed and laptop re started after which firefox would not open. uninstalled firefox and re downloaded and installed. after when I tried to open firefox it says another version of firefox is already running. tried task manager but it said no programs running. firefox will not open at all.
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(solutions) 1-Update Firefox
Every Firefox release includes a number of fixes for crashes that people have reported. Making sure you have the latest version may fix your crash.
2-Update your Internet Security software
Make sure you have the latest version of your Internet security software (including firewalls, antivirus programs, anti-spyware programs, and more).
3-Check to see if the crash happens in safe mode
If updating software didn't work or if Firefox crashes on startup, use the steps below to test whether the crash happens in Firefox Safe Mode or not and then follow the instructions in the recommended articles.
Note: You can also start Firefox in Safe Mode by holding down the shift key while starting Firefox.