[tor-bugs] #15988 [Tor Browser]: Update Tor Browser design documentation for 4.5.1

[Tor Bug Tracker & Wiki]

#15988: Update Tor Browser design documentation for 4.5.1
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 Reporter:  gk                    |          Owner:  tbb-team
     Type:  task                  |         Status:  new
 Priority:  normal                |      Milestone:
Component:  Tor Browser           |        Version:
 Keywords:  TorBrowserTeam201505  |  Actual Points:
Parent ID:                        |         Points:
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 We considerably changed Tor Browser behavior when moving from FQDN
 isolation to binding identifiers and circuits to the base domain. We
 should update the design document and include a motivation for this move.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/15988>
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