FireFox fails to load ?

[Yogi_Bear]

I'm using FireFox 57.x and abruptly today FireFox fails to load; I've tried numerous times with no success ? Although the task manager is showing FireFox as loaded ?

[DanRaisch]

Are you killing the Firefox process in Task Manager before trying again to launch Firefox?

[Yogi_Bear]

Yes.

[DanRaisch]

Have you tried starting Firefox in Mozilla Safe Mode? http://kb.mozillazine.org/Safe_mode
If no improvement using Safe Mode, do you have the same problem if you create a new profile and test it with no extensions or non-default themes installed?
http://kb.mozillazine.org/Profile_Manager
and
http://kb.mozillazine.org/Creating_a_ne ... on_Windows

Also see http://kb.mozillazine.org/Standard_diagnostic_-_Firefox

[Yogi_Bear]

Hi, safe mode seems to have solved the problem.

[DanRaisch]

Safe Mode is not a solution, it's a diagnostic step. When things work properly in Safe Mode but not in Standard Mode it often indicates that an installed extension is causing problems. Try disabling all extensions but one and then close and restart the program. (Disable them by using menu path Tools->Addons->Extensions->click on "Disable" for every extension but one.) See if the problem is present. If not, enable an additional extension and close and restart the application. Repeat this procedure until the problem reappears. The last enabled extension will be the cause of the problem.