[tor-bugs] #18545 [Tor Browser]: Review Firefox Developer Docs and Undocumented bugs since FF38esr

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#18545: Review Firefox Developer Docs and Undocumented bugs since FF38esr
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 Reporter:  gk                              |          Owner:  tbb-team
     Type:  task                            |         Status:  new
 Priority:  Very High                       |      Milestone:
Component:  Tor Browser                     |        Version:
 Severity:  Critical                        |     Resolution:
 Keywords:  ff45-esr, TorBrowserTeam201603  |  Actual Points:
Parent ID:                                  |         Points:
 Reviewer:                                  |        Sponsor:  None
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Comment (by gk):

 For Firefox 41 I have:

 1) SVG icon are no supported as site icons
 (https://bugzilla.mozilla.org/show_bug.cgi?id=366324) -- does that work
 with out SVG disabling patch properly?

 2) `link rel=preconnect` supports a `crossorigin` attribute now (#16998
 for the whole feature)

 3) canvas got a captureStream method; we should make sure that our canvas
 blocker
 takes care of that one as well
 https://bugzilla.mozilla.org/show_bug.cgi?id=1032848

 4) failIfMajorPerformanceCaveat might aid in fingerprinting
 (https://bugzilla.mozilla.org/show_bug.cgi?id=1164970)

 5) user timing API in Web workers might expose (new) high resolution timer
 to content
 https://bugzilla.mozilla.org/show_bug.cgi?id=1155761

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/18545#comment:8>
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