captive portal: Infinite loop when 'identity mismatch' error is raised.
To reproduce this error, launch Tor Browser from behind a captive portal for which you haven't yet agreed to the terms. A window pops up reporting a tor error with the phrase "identity mismatch". Clicking through it will lead to a new window for "Tor failed to launch". Clicking through that will bring you back to the error window for "identity mismatch". This unending parade of error windows will continue even if one disconnects from the network. It is impossible to close Tor Browser at this point without sending a SIGKILL.
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