What security software are you running? Disable it, reboot and try again. 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

this seems like an obvious blow off answer, I did not change any security on my system, so why would this suddenly come up?

What do you have set here? see screenshot

I do not see a screenshot?

Okay. Did you try safe mode?

This forum upload process has issues daily. smh ;-/

I have use system proxy, is that the prob?

Can you show what you have set there?

I set it to match the screenshot you sent

What happened... Issue resolved? What security software are you running?

Thank you very much, that seems to fixed it

Look special K... My answer was the solution not yours. LMAO Good night.