Create Seatbealt profile(s) for Tor Browser

We need sandboxing profiles for Tor Browser. I pinged trams recently on #tor-dev as he worked on this for Tor Browser years ago (https://lists.torproject.org/pipermail/tor-qa/2013-November/000230.html ff.). He suggested we look at his IronFox (https://www.romab.com/ironfox/) and it would probably enough to just copy them over. We can get a .tar.gz bundle as well. (And I guess he would help in case we have questions ;) )

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