[tor-bugs] #13313 [Tor Browser]: Enable bundled fonts in Tor Browser

[Tor Bug Tracker & Wiki]

#13313: Enable bundled fonts in Tor Browser
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     Reporter:  dcf      |      Owner:  tbb-team
         Type:           |     Status:  closed
  enhancement            |  Milestone:
     Priority:  normal   |    Version:
    Component:  Tor      |   Keywords:  tbb-fingerprinting-fonts,
  Browser                |  tbb-5.0a4, TorBrowserTeam201507R
   Resolution:  fixed    |  Parent ID:
Actual Points:           |
       Points:           |
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Comment (by dcf):

 Moritz and I found a case where bundling fonts was not sufficient to
 determine Tor Browser's font selection. It was choosing different fonts
 (serif versus sans-serif) for the "cursive" and "fantasy" styles of one
 particular code point.
  * https://lists.torproject.org/pipermail/tor-qa/2015-August/000651.html
  * https://lists.torproject.org/pipermail/tor-qa/2015-August/000654.html

 I speculated:
   That's very interesting. In just that one code point, your computer
 chooses a sans-serif font for the "fantasy" and "cursive" styles, while
 mine chooses a serif font. Probably we would find more examples if we
 tested more of Unicode.
   I would not have expected a difference like this. It does not come down
 to small rendering differences; the browser is simply choosing a different
 font. Perhaps there is something non-deterministic about how Firefox (or
 Fontconfig) loads its font files. Like, maybe it iterates a directory in
 inode order and takes the first match when there is a tie.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/13313#comment:37>
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