Firefox won't start up, when clicked, whereas every other browser works.

See: *http://kb.mozillazine.org/Browser_will_not_start_up Can you start Firefox in Safe mode? *https://support.mozilla.org/kb/Safe+Mode *https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes You can use one of these to start Firefox in <u>Safe mode</u>: *On Windows, hold down the Shift key while starting Firefox with a double-click on the Firefox desktop shortcut *On Mac, hold down the Options key while starting Firefox *Help > Restart with Add-ons Disabled ---- Another possible cause is security software (firewall,anti-virus) that 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 internet 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

This reply was not helpful because firefox will not start. I have spent hours researching this problem without any progress, I have now resorted to my reliable I.E. which, fortunately is still working ok. Soloist