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How do I get Firefox to load?

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After Firefox updated last night, the web browser no longer works. I reset my router and deleted and reinstalled Firefox to no effect. My ISP verified that there is no problem there. IE works fine.

This happened

Every time Firefox opened

Firefox updated

User Agent

Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; .NET CLR 2.0.50727; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)

After Firefox updated last night, the web browser no longer works. I reset my router and deleted and reinstalled Firefox to no effect. My ISP verified that there is no problem there. IE works fine. == This happened == Every time Firefox opened == Firefox updated == == User Agent == Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; .NET CLR 2.0.50727; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)

All Replies (1)

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A possible cause is security software (firewall) that blocks or restricts Firefox without informing you about that, maybe 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.

See Configure firewalls so that Firefox can access the Internet and http://kb.mozillazine.org/Firewalls