After years of using firefox, it suddenly will not connect to the internet. Internet Explorer connects with no problem.

I'm using a WIFI connection and have had no problem for many months. All of a sudden, I get "Problem loading page"; "Firefox cannot establish a connection with the server". MS Internet Explorer works fine.

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
*http://kb.mozillazine.org/Error_loading_websites

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