Greg's browserfeedwriter javascript finds TBB's full path on Windows

http://pseudo-flaw.net/tor/torbutton/browserfeedwriter-error.html

Shondoit went there using TBB on Windows and it said "found location: "file:///[...]/Tor%20Browser/FirefoxPortable/App/Firefox/components/FeedWriter.js" where [...] is his install location.

Reported at https://blog.torproject.org/blog/new-tor-browser-bundles-17#comment-15627