First bug on the list now fixed! :)
A full list of bugs found through fuzzing would show that about 80% have been fixed. It's only depressing if you focus on the unfixed bugs ;)
It's sad to see all those bugs assigned to nobody...
I occasionally pre-test a big patch (e.g. harfbuzz) or pref flip (e.g. html5.enable). But mostly I test mozilla-central debug builds straight from Tinderbox.
Do you try fuzz testing builds with the proposed patches?
Nice! But it's sad to have to implement these kinds of mechanisms-- people should just fix reported bugs quickly :). We don't have any of this kind of stuff and basically just stop testing a comp...