I upgraded to the most recent version of Firefox, and for awhile, I was getting a “…due to mozilla’s security features” pop-up error on a lot of websites I visited.
I found the solution to get rid of this highly annoying “feature” from a user named Castaign buried in the Firefox forum.
“This is likely caused by the Web Fixer add on. If you have this add on installed, you should have a small icon on the bottom right corner of Firefox (next to the authentication padlock icon) that says Fix. Click this to access the Web Fixer menu and choose Quick Settings –> Change Settings –> Other Options tab. Uncheck the box labeled “Show message on security errors”. You may need to restart Firefox for the fix to work.”