Try one of these articles:
- TLS Error Reports Firefox TLS Error Reports; what they are and why you might want to share yours.
- Configure firewalls so that Firefox can access the Internet A firewall controls what programs can access the Internet. Find information about configuring your firewall to allow Firefox access to the Internet.
- Fix problems connecting to websites after updating Firefox Learn to troubleshoot and fix problems connecting to websites that start immediately after updating to a new version of Firefox.
- Fix problems with Facebook games, chat and more This article describes how to troubleshoot problems, like those with games or chat, that you might encounter while using Facebook in Firefox.