Since upgrading to 8.0.1, on 80% of the addresses entered Firefox give me a "server not available - try again" error message. What did you guys do?

Question

Since upgrading two days ago to Firefox 8.0.1 I get this error message on 80% of the addresses I try to access:
Server not found
Firefox can't find the server at orders.tigerdirect.com
Check the address for typing errors such as
ww.example.com instead of
www.example.com
If you are unable to load any pages, check your computer's network
connection.
If your computer or network is protected by a firewall or proxy, make sure
that Firefox is permitted to access the Web.
What's the problem with the upgrade?

Answer 1

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.org/kb/Server+not+found
*https://support.mozilla.org/kb/Firewalls