I could use \Firefox ok but all of a sudden i can no longer use it. I get a message saying there is a problem connecting and although i am connected to the internet and can use other browsers, i cannot use firefox. It is allowed through my firewall.

i think i may have caused this wheni inadvertently pressed upgrade when i had an internet explorer message appear.

A possible cause is security software (firewall) 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 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.com/kb/Server+not+found
*https://support.mozilla.com/kb/Firewalls

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