TOR creates 5 circuits initially. Does the TOR browser do the same?
Tor Browser launches it's own copy of tor.
The tor that it launches doesn't differ from any other instance of tor, except by configuration differences defined in torrc and torrc-defaults.
Anything that tor does, the tor launched by Tor Browser will also do.
tor opportunistically opens a number circuits, Tor Browser's tor does too.
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But the browser creates a new circuit for each unique domain while TOR's number of circuits does not exceed 5. So the browser does have it's own functionality to. – George J. Adams May 1 '17 at 21:27
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But the browser creates a circuit for each new domain. TOR specifically doesn't do that - It will only do that if the current circuits can't serve a certain request. – George J. Adams May 1 '17 at 22:03
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1Tor doesn't do it by default. Tor can do it: Tor Browser's Tor Does Not Differ From Any Other Instance Of Tor. See this answer for an explaination of how Tor Browser's circuit isolation works. – cacahuatl May 2 '17 at 0:04
