Firefox Version 91.0.2 (64-bit) will only access the internet in troubleshooting mode, other browsers work fine.
I'm using Firefox Version 91.0.2 (64-bit) on the latest version of Windows 10 0n a HP laptop. After the last 3 Firefox updates, I have not been able to access the internet unless I restart in troubleshooting mode. All other browsers work great. Help, can't figure out what is wrong. I'm also using McAFee, and have checked all settings. Regards, John
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https://support.mozilla.org/en-US/kb/diagnose-firefox-issues-using-troubleshoot-mode
Safe Mode is a troubleshooting mode that temporarily turns off hardware acceleration, resets some settings, and disables add-ons (extensions and themes), any userChrome.css/userContent.css files, and some other advanced features to help you assess whether these are causing the problem. If the problem goes away, that tells us one thing. If it does not, that tells us something else.
It could be the work of one of your add-ons, or it could be Hardware Acceleration. How to disable Hardware Acceleration {web link}
Type about:addons<enter> in the address bar to open your Add-ons Manager. Hot key; <Control> (Mac=<Command>) <Shift> A)
In the Add-ons Manager, on the left, select Extensions. Disable a few add-ons, then Restart Firefox.
Some added toolbar and anti-virus add-ons are known to cause Firefox issues. Disable All Of them.
If the problem continues, disable some more (restarting FF). Continue until the problem is gone. After, you know what group is causing the issue. Re-enable the last group ONE AT A TIME (restarting FF) until the problem returns.
Once you think you found the problem, disable that and re-enable all the others, then restart again. Let us know who the suspect is, detective.
Boot the computer in Windows Safe mode with network support to see if that has effect in case security software is causing problems.