[tor-bugs] #2875 [Tor bundles/installation]: Spoof Desktop Resolution in TorBrowser

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#2875: Spoof Desktop Resolution in TorBrowser
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 Reporter:  mikeperry                 |          Owner:  mikeperry
     Type:  enhancement               |         Status:  new      
 Priority:  normal                    |      Milestone:           
Component:  Tor bundles/installation  |        Version:           
 Keywords:                            |         Parent:  #2871    
   Points:                            |   Actualpoints:           
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 We currently have Javascript hooks in Torbutton to spoof our desktop
 resolution, but this information is now available due to CSS3 media
 queries. We need to patch Firefox at a deeper level to prevent any pieces
 of it from obtaining valid desktop resolution information.

 This could work as an about:config approach that tells the patch to either
 spoof the next largest common desktop size that is bigger than the window,
 or to a specific fixed size, or to the size of the content window (as if
 the content window only was the entire desktop).

 We'll also want to try to remap mouse event coordinates back to this
 spoofed desktop:
 https://developer.mozilla.org/en/DOM/Event/UIEvent/MouseEvent

 Spoofing the content window to the desktop size is the cleanest approach
 that leaks the least information, but the Panopticlick test makes people
 believe that they are always unique because this is such a rare thing to
 do relative to the rest of the web, so people are always wrongly
 complaining we don't defend against Panopticlick :/

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/2875>
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