[tor-bugs] #19955 [Applications/Tor Browser]: Warning that favicon load request got cancelled is confusing

[Tor Bug Tracker & Wiki]

#19955: Warning that favicon load request got cancelled is confusing
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     Reporter:  gk                        |      Owner:  tbb-team
         Type:  defect                    |     Status:  new
     Priority:  Medium                    |  Milestone:
    Component:  Applications/Tor Browser  |    Version:
     Severity:  Normal                    |   Keywords:
Actual Points:                            |  Parent ID:
       Points:                            |   Reviewer:
      Sponsor:                            |
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 After Mozilla fixed #18513 a confusing warning is often visible in the
 console:
 {{{
 When cancelling a request for chrome://browser/skin/preferences/in-
 content/favicon.ico because the inner window was destroyed or a new
 favicon was loaded for it, it was already canceled!
 PlacesUIUtils.jsm:109:0
 }}}
 Mozilla seems to fix this with
 https://bugzilla.mozilla.org/show_bug.cgi?id=1279650. We could think about
 backporting this to Tor Browser.

 This was first reported on our blog with https://blog.torproject.org/blog
 /tor-browser-65a2-released#comment-196614.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/19955>
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