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Does Tor hide my mac address as well as my IP address?
And what about if I have another browser such as IE or Firefox open at the same time as Tor, but not in Tor?
In general when you visit a website the website won't be able to see your MAC address, even when not using Tor.
Only the hop directly after you is able to see your MAC, and chances are there's 10+ hops between you and a given web server.