Show the issue. What version of Firefox? Have you tried Firefox in Safe Mode? https://support.mozilla.org/en-US/kb/diagnose-firefox-issues-using-troubleshoot-mode#w_how-to-start-firefox-in-4troubleshoot-modesf5safe-modesf

I'm running 91.5.1esr and tried safe mode, but still will not load :(

Can you update or install the current version to test. Also, share a screenshot of what your are getting. see screenshot

I just updated and am running 96.1esr and still it will not load. I've attached a screen shot. Microsoft Edge has no problem loading and functioning.

Is there a reason for using ESR version of Firefox? https://www.mozilla.org/en-US/firefox/all/#product-desktop-release