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The problem comes from the antivirus software this checks HTTPS connections and certificates, many think it would be a virus as in the support cases, but this can be set in the antivirus software.

https://support.mozilla.org/de/questions/1024043#question-reply

Dark Mode used to work beautifully in Firefox. Today it stopped working. I can choose Dark Mode in the settings page, and the settings page itself then uses Dark Mode. But Dark Mode does not work in any of the other pages, only the settings page. I think it must be a flaw in an update that was installed automatically today. (September 7, 2021)

Is there a way to uninstall this update and go back to the previous version. Dark Mode used to work beautifully and Firefox was my favorite browser. Can someone help? Thanks.

I bought a new phone from AT&T and I wanted to use Firefox and get away from chrome and when they used smart transfer to transfer all my data from the old phone to the new phone no open tabs or passwords came with it and now I can't figure out how to import them. I've searched on Google and tried to follow the steps but I don't have the options that they say to use. I have tried installing Firefox on my old phone and importing them from chrome to Firefox on my old phone and then to the new phone and that doesn't work. I managed to export the passwords from Chrome on my old phone to Chrome on my new phone but I can't get the open tabs to and I can't transfer my passwords from chrome on my new phone to Firefox on my new phone. Please, can anybody help me?

Help! Firefox is blocking my access to Walgreens Weekly Ads context due to private browsing but not using and/or tracker or ad blockers but turned off for this site

Is there a quick short cut key stroke to turn ON/Off the Firefox browser screen Dark Theme? If the Windows 10 professional 64 Bit screen settings are set for Dark theme in Hi Contrast settings, for the visually impaired, The Firefox browser displays in bright white screen.

Hi, I've been having issues with Firefox for some time now. Every page I got to throws a NS_ERROR_NET_INADEQUATE_SECURITY error. I cannot fix it by setting network.http.spdy.enabled.http2 to false is because Firefox then starts crashing. In the past I've gone around the error by turning http2 off, but recently, first the developer edition, then after today's update to 91.0-0.1 of stable version Firefox crashes if I turn the feature off.

The developer Edition started throwing NS_ERROR_NET_INADEQUATE_SECURITY sometime in spring, then started crashing in June I think. The stable version followed soon as described above.

I am submitting this ticket from a beta version, which for some reason does not have this issue.

I thought it may be the Linux version of Eset, but removing it did not help. I cannot think of any other reason why am I getting those errors, but it seems I am alone because my colleagues don't seem to have this issue neither on macOS, nor Windows.

I've been not able to access any website 'cause of this PR_END_OF_FILE_ERROR I clearly checked it and connected all the networks but it's not accessing any website, i need help ASAP

After the last update, I get the "PR end of file" error on several of my trusted web sites, like my bank. I like FF and have used it for years, but keep getting frustrated with things like this. Its equally frustrating to have to wade thru the "fixes". I shouldnt have to do this. Brave is looking better and better