[tor-bugs] #7265 [Firefox Patch Issues]: Only display Canvas message for first parties; simply log third parties

Fri May 31 23:27:24 UTC 2013

#7265: Only display Canvas message for first parties; simply log third parties
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 Reporter:  mikeperry                                        |          Owner:  mikeperry   
     Type:  enhancement                                      |         Status:  needs_review
 Priority:  major                                            |      Milestone:              
Component:  Firefox Patch Issues                             |        Version:              
 Keywords:  tbb-fingerprinting, tbb-bounty, MikePerry201306  |         Parent:              
   Points:                                                   |   Actualpoints:              
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Comment(by mikeperry):

 Nearly every github project URL caused me to get a canvas prompt. Or at
 least it did until today. Perhaps they changed their site? I wonder if we
 had anything to do with that.

 I will keep an eye out for other websites.

 I've also noticed that PDF.js uses the canvas for image-heavy PDFs (for
 example, scroll midway through http://freehaven.net/~arma/slides-
 dimacs13.pdf in a TBB that has PDF.js installed, such as a Gitian build).
 It would be nice to find some way to allow PDF.js to use the canvas
 without allowing the website hosting the PDF to do so..

-- 
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/7265#comment:6>
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