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}

I think I have this issue after I enabled profile streaming in GPO. not sure but I wonder f it might be related.

there was not any issue with this profile streaming on the other servers.

I had to disable profile streaming for now. could you please give me more information about firefox profile settings?

With the fresh install, I specified a new profile for firefox but it is still not working. it even cannot open about:addons

If you think something is causing an issue, disable it as a test.