Did you try with Firefox in Troubleshoot Mode? https://support.mozilla.org/en-US/kb/diagnose-firefox-issues-using-troubleshoot-mode#search What security software besides MS Defender are you running? Windows home or pro? If you're running Windows Pro version, I would test in Windows Sandbox to confirm. https://www.howtogeek.com/399290/how-to-use-windows-10s-new-sandbox-to-safely-test-apps/

Can’t Firefox tell if it locks up multiple times and offer suggestions for remedy. I am not a techie, these apps need to do more for the day to day user. Until they do, I’m moving on.

Mark it as resolved if you have no other questions.