[tor-bugs] #5798 [Firefox Patch Issues]: Improve persistence and WebFont compatibility of font patch

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#5798: Improve persistence and WebFont compatibility of font patch
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 Reporter:  mikeperry                      |          Owner:  mikeperry
     Type:  defect                         |         Status:  new      
 Priority:  major                          |      Milestone:           
Component:  Firefox Patch Issues           |        Version:           
 Keywords:  tbb-fingerprinting, interview  |         Parent:  #7248    
   Points:                                 |   Actualpoints:           
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Comment(by mikeperry):

 Dug down this rabbit hole a bit more. If we could just call
 nsRuleNode::mFont->GetType(), we could check the type for FONT_FACE_RULE.
 But we can't due to unknown concrete type of mFont.. We might be able to
 QI to nsIDOMCSSRule and use GetType(), but I think that might actually be
 mFont->mDOMRule.type, not mFont->type. This has the same problem...

 I'll try grepping the source for more instances of FONT_FACE_RULE later..
 Maybe there are other places where it gets copied to something we can
 inspect from nsRuleNode. Need to switch back to trying to salvage FF17
 right now.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/5798#comment:10>
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