The page itself is a fake Microsoft one, but it has a username/password popup that says, vaguely, that you may be sent to prison or given a fine. Closing this dialog results in a very large “Mal1cious P0rn0graphic Spyware/Riskware” alert() dialog. Also includes female TTS voice throughout. The number is (877) 412-0215, fake error code is 0x80072EE7. You were trying to go to Reddit when you got the error. Pictures: https://imgur.com/a/OqqtK47