When I try to sign on to the Internet, I get the message "Unable to connect,- Firefox can't establish a connection to the server at en-us.start3.mozilla.com
When I try to sign on to the web with Firefox, The message I receive is "Unable to Connect- Firefox can't establish a connection to the server at en-us.start3.mozilla.com. This problem began on July 7th, 2011.
Thank you, John Holliday
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go to Help Menu -> select "Restart with Add-ons Disabled"
Firefox will close then it will open up with just basic Firefox. You can enable the Add-ons later. Check and tell if its working.
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: