What OS? What security software are you running? I guess Webroot... ;-) 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

Some problems occur when your Internet security program was set to trust the previous version of Firefox, but no longer recognizes your updated version as trusted. Now how to fix the problem: To allow Firefox to connect to the Internet again;

• Make sure your Internet security software is up-to-date (i.e. you are running the latest version).
• Remove Firefox from your program's list of trusted or recognized programs. For detailed instructions, see

Configure firewalls so that Firefox can access the Internet. {web link}

A big issue of late is;

Could this be relevant? A couple of other users identified Webroot (security software) as blocking 64-bit Firefox 97 -- released today -- from running properly:

• https://support.mozilla.org/questions/1367248
• https://support.mozilla.org/questions/1367301

If you are still running an earlier release of Firefox, this would not be your issue.

After consulting with WebRoot, they advised this was a known issue. The fix was to remove and reinstalled the WebRoot application.

I am running Windows 11 and do use Webroot. Firefox will not run in safe/troubleshoot mode.. nothing happens when I chose that option. Firefox version is 97.0 64 bi

What OS? What security software are you running? I guess Webroot... ;-) 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

When I couldn't use troubleshoot mode I decided my only acceptable option was to create a new profile. https://support.mozilla.org/en-US/kb/profile-manager-create-remove-switch-firefox-profiles

https://www.mozilla.org/firefox/97.0.1/releasenotes/

Fixed Works around problems with WebRoot SecureAnywhere antivirus rendering Firefox unusable in some situations