I think the FBI has been very naughty. So much so, apparently, that what the defendant was accused of pales in comparison. I don't buy the explanation that the exploit itself is too valuable to reveal. More likely than not it was something already fixed in Firefox but not yet patched in the Tor Browser. That's what they used on Freedom Hosting IIRC. So when they say "endanger future investigations" it sounds more like "endanger future convictions" (because judges might balk if they knew what was really going on).
Biting the hand that feeds IT
