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I use google translate my two questions: Is it possible to learn the ip through html5 video if I have an android and orfox orbot
or through a PC with Windows 7 and tor browser?
No, HTML5 video on Orfox and Tor Browser should go over the Tor network and should not reveal a users IP address.
I cannot say there are not, or will never be any bugs but efforts have been made to ensure that they do properly utilise Tor and don't leak.
Required, but never shown