It is possible that your firewall or other security software blocks or restricts Firefox or the plugin-container process without informing you, possibly after detecting changes (update) to the Firefox program. Remove all rules for Firefox and the plugin-container from the permissions list in the firewall and let your firewall ask again for permission to get full, unrestricted, access to install for Firefox and the plugin-container process and the updater process. See: *https://support.mozilla.org/kb/Server+not+found *https://support.mozilla.org/kb/Firewalls *https://support.mozilla.org/kb/fix-problems-connecting-websites-after-updating ----- You only see the Refresh/Reset button on the "Help > Troubleshooting Information" page if you have started Firefox with the profile that is marked as the current default profile in profiles.ini and shows as selected when you use the Profile Manager. *http://kb.mozillazine.org/Profile_Manager