Font defense in 5.0a4 crashes OS X 10.6.8

The font fingerprinting defense in Tor Browser 5.0a4 crashes on OS X 10.6.8 reliably according to a user: https://blog.torproject.org/blog/tor-browser-50a4-released#comment-99750. Attached is the debug output that got posted on pastebin (http://pastebin.com/eJSr0aKC).

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