I am running a local apache server for website development. I have always accessed these local sites with http:// Suddenly today firefox is redirecting to https:// and I receive the "Secure Connection Failed" error. I have completely removed the firefox profile by deleting the ~/.mozilla and ~/.cache/mozilla directories, but the problem persists. I have set browser.urlbar.autoFill to false, but the problem persists. I am not running any extensions or add ons. No changes to the apache configuration have been made. No system updates have been installed since it was working yesterday. Even with apache stopped, the local sites still immediately redirect to https:// The sites are directed to localhost via the /etc/hosts file, for example: 127.0.0.1 examplelocalsite.dev I have restarted the computer and the problem persists. The problem is not occurring in Chrome. The problem is not occurring with external http:// websites. I am not running any type of security software other than a basic firewall configuration with ufw The problem persists with ufw disabled. I have purged the firefox installation with apt purge firefox and reinstalled fresh but the problem persists.