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Exception Breakpoint on shutdown pc; must force quit, then restore all tabs on next session

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On shutdown, after using firefox, my PC displays error message '...Exception Brekpoint has been reached (0x80000003) occurred in the application at location 0x5b42fe99'.

When I force quit and shut down computer, all is fine.

When I reopen firefox on my next session, I get the 'oops - something went wrong' screen and must reload all tabs.

This is occurring on both my windows 7 pc, and windows 10 laptop.

Any idea what this could be about?

On shutdown, after using firefox, my PC displays error message '...Exception Brekpoint has been reached (0x80000003) occurred in the application at location 0x5b42fe99'. When I force quit and shut down computer, all is fine. When I reopen firefox on my next session, I get the 'oops - something went wrong' screen and must reload all tabs. This is occurring on both my windows 7 pc, and windows 10 laptop. Any idea what this could be about?
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Start Firefox in Safe Mode {https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode} by holding down the <Shift> key (Mac = Options key), and then starting Firefox.

A small dialog should appear. Click Start In Safe Mode (not Refresh). Is the problem still there?

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Let’s do a full clean re-install; Download Firefox For All languages And Systems {web link}

Save the file. Then Close Firefox.

Using your file browser, open the Programs Folder on your computer.

Windows: C:\Program Files C:\Program Files (x86)

Mac: Open the "Applications" folder. https://support.mozilla.org/en-US/kb/how-download-and-install-firefox-mac

Linux: Check your user manual. If you installed Firefox with the distro-based package manager, you should use the same way to uninstall it. See Install Firefox on Linux; https://support.mozilla.org/en-US/kb/install-firefox-linux

If you downloaded and installed the binary package from the Firefox download page, simply remove the folder Firefox in your home directory. http://www.mozilla.org/firefox#desktop ++++++++++++++++++++++++++++ Do Not remove the profiles folder.

Look for, and rename any Mozilla or Firefox program folders by adding .old to them. Do not rename the Mozilla Thunderbird folder if there is one.

After rebooting the computer, run a registry scanner if you have one. Then run the installer. If all goes well, remove the OLD folders when you are done. +++++++++++++++++++++++++++ If there is a problem, start your Computer in safe mode and try again.

http://encyclopedia2.thefreedictionary.com/Linux+Safe+Mode This shows how to Start all Computers in Safe Mode; Free Online Encyclopedia

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Use one of these to close Firefox if you are currently doing that by clicking the close X on the Firefox title bar.

  • "3-bar" menu button -> Exit (Power button)
  • Windows: File -> Exit
  • Mac: Firefox -> Quit Firefox
  • Linux: File -> Quit