Firefox – Why ‘This Connection is Untrusted’ for practically every site on Mozilla Firefox

certificatefirefox

This started a couple of months ago and pops up for just about every site, including Google, Macy's, DSW, Outlook.com, etc. These are all regularly visited sites so there should be no problem. There is no problem if I use Chrome or Internet Explorer.

Searching for resolution has indicated the problem can be fixed by correcting the date/time or that it is due to issues with BitDefender.

Neither is my problem. My clock & date are connected to our network and are correctly displayed. There is no BitDefender installed on my machine.

Disabling the certificate validation is also recommended as a solution however, the problem still continued after following the steps to disable. I have also removed the program entirely from my computer and reinstalled it. Still running into the same issue.

Does anyone have a way to truly fix this ?

Thanks

Best Answer

I had this same problem and it started yesterday (6/22/2013) when my computer did an auto-update: "Mozilla FireFox 30.0 (x86 en-US)". I think that the update didn't download properly, or it was a corrupt file or something. I tried a bunch of things but most of the stuff I was finding on-line didn't work.

Uninstalling FireFox and re-installing the most recent version fixed the problem.

Go to your Control Panel; uninstall FireFox, then go to the FireFox website in another browser and re-install. That worked for me!