I've got a weird problem with my Firefox 27.0.1: Literally any webpage I want to visit is automatically requested via HTTPS, and that means I constantly get "Untrusted Connection" warnings - see first image below.
I am forced to either give up or accept a certificate exception for the site (see second image below). As a workaround, I can add an exception manually but this gets tedious real quick, because it needs to be done for every site I visit.
What is causing this annoying behavior, if it's not the HTTPS Everywhere plugin?
I had the HTTPS Everywhere plugin installed and I disabled that - it didn't solve the problem so I uninstalled it instead. That still has not solved the problem. Could it be something about the corporate firewall that has been changed?