Windows 10 reached EOS (end of support) on October 14, 2025. If you are on Windows 10, see this article.

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Have used Firefox on many Windows Versions. Now on win 10, Firefox does not connect to any web sites.

confusedbywin10

Suddenly in the middle of a session, cannot connect to any web sites. Tried all fixes mentioned, so used Micrsoft Edge. No problems. Disconnect Windows Firewall, and Firefox works fine. Reconnect Firewall and Firefox will not connect to web sites. HELP!!

Suddenly in the middle of a session, cannot connect to any web sites. Tried all fixes mentioned, so used Micrsoft Edge. No problems. Disconnect Windows Firewall, and Firefox works fine. Reconnect Firewall and Firefox will not connect to web sites. HELP!!

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Hello, please see for help: Configuring Windows 10 Firewall.

thank you

Did that - the only thing that worked is to disable the Windows Firewall. If I access a site, with the Firewall disabled, then when in the middle of the session reset the Firewall, the Session immediately stops with "Connection Lost" message.