[tor-bugs] #8156 [Firefox Patch Issues]: Tweetdeck's Web interface can't post tweets in TBB

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#8156: Tweetdeck's Web interface can't post tweets in TBB
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 Reporter:  cypherpunks            |          Owner:  brade   
     Type:  defect                 |         Status:  assigned
 Priority:  normal                 |      Milestone:          
Component:  Firefox Patch Issues   |        Version:          
 Keywords:  tbb-usability-website  |         Parent:  #6564   
   Points:                         |   Actualpoints:          
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Comment(by mikeperry):

 Hrmm.. Very strange. cypherpunks: Did you try this out from a totally
 fresh TBB directory?

 Wrt fonts: We should have stopped blocking remote @font-face in TBB-alpha,
 but unfortunately our anti-fingerprinting font limiting patch
 (https://gitweb.torproject.org/torbrowser.git/blob/maint-2.4:/src/current-
 patches/firefox/0011-Limit-the-number-of-fonts-per-document.patch) counts
 remote @font-face towards those limits, which usually means we run out of
 fonts and start blocking them. This is technically #5798, but we might
 want to break it out into a separate ticket.

 I've banged on the font patch for several hours and was unable to find a
 route from the CSS evaluation rules to the actual source of the fonts (to
 determine if they were local or @font-face, to exempt the remote ones).
 The best idea I had was doing a QueryInterface on nsRuleNode::mFont to try
 to convert it to an nsIDOMCSSFontFaceRule and then exempt the ones that
 succeed that QI. Unfortunately, none of the @font-face fonts seem to
 actually succeed this QI. If either of you guys have any suggestions for
 other approaches I could try, I am willing to try coding them and testing
 them myself, since it's pretty important.. But I'm at a loss right now :/

-- 
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/8156#comment:16>
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