Is it possible on a Mac to set up multiple profiles for the TorBrowser, each with different preferences, and have two TorBrowsers open at once?
Yes it is possible, It all depends on the torrc file in the folder or the tor browser,
If you just want different settings, and not run multiple profiles at the same time, you exchange the torrc file.
If you want to run different settings at the same time, copy the folder multiple times, and make sure that the settings TorDirectory and SocksPort are different. You will also have to change the Socksport of the used proxy in the torbrowser.
Any questions? ask!