[tor-bugs] #4795 [Firefox Patch Issues]: TBB does not like the standard theme on Windows XP, Vista, and 7

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#4795: TBB does not like the standard theme on Windows XP, Vista, and 7
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    Reporter:  runa                  |       Owner:  mikeperry        
        Type:  defect                |      Status:  needs_information
    Priority:  major                 |   Milestone:                   
   Component:  Firefox Patch Issues  |     Version:                   
  Resolution:                        |    Keywords:                   
      Parent:                        |      Points:                   
Actualpoints:                        |  
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Comment(by mikeperry):

 Replying to [comment:44 Shondoit]:
 > Replying to [comment:43 mikeperry]:
 > > If someone who can actually compile our beast on Windows can narrow it
 down, it might help me to more easily hazard a guess.
 > The lack of _moz_windows_default_theme is the cause of the transparent
 popups.
 > The lack of _moz_windows_compositor is the cause of the non-translucent
 title bar and blacked out control box.
 > When these are uncommented everything looks fine and dandy. Not sure how
 this affects CSS fingerprinting.

 Yeah, from my read of https://developer.mozilla.org/En/CSS/Media_queries
 it sounds like both of these are available to content window CSS, which
 would be an instant leak of at least OS if not also themeing info..

 I wonder if it is the absence of these rules that is messing us up... I
 wonder what happens if you hack GetSystemMetric in
 layout/style/nsMediaFeatures.cpp to always pick one value for those atoms?
 Changing that function to always do aResult.SetIntValue(0) or 1, for
 example...

 Otherwise, if a bloody hack doesn't work, we'll need to figure out how to
 prevent these things from getting exported to the content window while
 still allowing chrome to use them...

 Incidentally, if you're able build all of TBB, we could use a full Windows
 build up on #5837 for comparison by other folks.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/4795#comment:45>
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