Hmm, sounds like a tricky one. Have you tried using Firefox’s “No Proxy” option just to see if it connects? If it does, then the issue is definitely with your proxy settings Mozilla.
Another thing—make sure your Windows 10 network settings aren’t overriding Firefox. Sometimes Windows likes to take control lol.
Another thing—make sure your Windows 10 network settings aren’t overriding Firefox. Sometimes Windows likes to take control lol.