[tor-bugs] #16448 [Tor Browser]: isolate favicon requests and caching by URL bar domain

[Tor Bug Tracker & Wiki]

#16448: isolate favicon requests and caching by URL bar domain
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     Reporter:               |      Owner:  tbb-team
  arthuredelstein            |     Status:  needs_review
         Type:  defect       |  Milestone:
     Priority:  normal       |    Version:
    Component:  Tor Browser  |   Keywords:  ff38-esr, TorBrowserTeam201506R
   Resolution:               |  Parent ID:
Actual Points:               |
       Points:               |
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Comment (by mikeperry):

 This patch looks OK to me. We should make sure to add tests both for
 default favicons, as well as favicons specified in HTML (as the latter may
 change if the OwnerDoc is chrome).

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/16448#comment:2>
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