Troubleshoot network errors when TLS key logging is enabled
Just in the past few days, Firefox is useless. Cannot access pages. I have not made any changes. Whatever you changed in Firefox screwed everything up. Links give error message. Your links give the same error. I've had to switch to MS Edge do do anything on my computer. Firefox blocked my online banking. Firefox blocked my VOIP phone app. Firefox is keeping me from opening emails.
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Your antivirus / security software vendor might have, on the other hand. The article specifically explains where to look for the culprit: Troubleshoot network errors when TLS key logging is enabled
Had to turn off Norton Safe Web . . . contacted Norton they suggested turning off extension in Firefox, doesn't help. Even got the error trying to reply to this post. Seems it's a real issue with Firefox/Mozilla. Don't have an issue with MS Edge. When I do inquiries answers all point to Firefox!
The question does not contain any particular error state and exact error codes, so it might be many different things, but from the description it sounds like the connection gets mangled before even reaching Firefox, as the help article explains. There's nothing to do with it at the browser level at that point. If other browsers are easier to fool by decrypting secure connections in front of them, that's not something Mozilla support can realistically help with.
While "Norton Safe Web" is not something I'd recommend personally, if installed correctly it should be able to "fake" its way to intercepting users' secure connections without causing errors, that's however something Norton support will need to assist you with. Only they know how it works and how they expect to inject it into individual browsers. (You might need to check for any updates to the security suite you're running.)
It would be nice to TALK with someone at Firefox/Mozilla. All links just take me to another version but does not answer the question what/how to fix. Norton says to turn off the extension/add-on in Firefox, I did that and has no affect. Only way to stop it to turn off safe web in the Norton 360 software, and yes it's the latest version. Something was changed in Firefox recently that is causing the issue.
You can e.g. next week if you're in Amsterdam (https://perfnow.nl — https://luma.com/fmd7pahn …) — they're nice folks. However how that's relevant to your specific third–party software interaction is hard to tell.
Norton support had threads in the past for various compatibility issues, they will know their SW better than anyone here, this sounds similar: https://community.norton.com/t/firefox-error-message/528403 https://support.norton.com/sp/en/us/home/current/solutions/v73924770
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