Catch-all circuits are not working properly in ESR 52 based Tor Browser
Looking at the console I see often output like
[03-15 07:54:18] Torbutton INFO: tor SOCKS: https://www.torproject.org/projects/torbrowser/RecommendedTBBVersions via :dceca4bdbd10c5b87865edd4fac205eb [03-15 07:54:18] Torbutton INFO: Failed to get credentials or browser from channel
It seems this is caused by
isolateCircuitsByDomain() not throwing anymore if there is no domain to isolate the request to. We should take care of that as that probably breaks our catch-all circuit handling.