Firefox crashes on shutdown, shows not responding, must use task manager to end task, windows says problem is with container.exe file

whenever i decide to shut down firefox, i click on the x in the first tab and it will not shutdown the program. i must go to task manager to close the program. i get an error report that says there was a problem with add-on container.exe. i have looked in my add-on list and i see no container.exe there. where is it coming from and how do i get rid of this problem. i have even tried to shutdown the program with the x in the upper right corner and it does the same thing. i have recently updated firefox and it still does the same thing.

Some added toolbar and anti-virus add-ons are known to cause
Firefox issues. '''Disable All of them.'''
Start '''[https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode Firefox in Safe Mode]''' {web Link} by holding down the '''<Shift><br> ''(Mac Options)'' ''' key, and then starting Firefox. Is the problem still there?

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