Some problems occur when your Internet security program was set to trust the previous version of Firefox, but no longer recognizes your updated version as trusted. Now how to fix the problem: To allow Firefox to connect to the Internet again;

• Make sure your Internet security software is up-to-date (i.e. you are running the latest version).
• Remove Firefox from your program's list of trusted or recognized programs. For detailed instructions, see

Configure firewalls so that Firefox can access the Internet. {web link}

Thank you for the info I ended up shutting down a feature on AVG internet security that put Firefox to sleep. That seemed to work but it's only happened with the most recent update of Firefox. Hopefully it'll last. Thanks again

That was very good work. Well Done. Please flag your last post as Solved Problem as this can help others with similar problems.

Contact AVG support and let them know.