> XUL extensions could use lots of things, but I don't know of any that
 > depend on JSFunctionSpec.  Is there a way to search AMO easily?  How
 > many extensions hosted at AMO or extension-mirror.nl (or whatever it's
 > called) even contain compiled code?
 >
 > /be

I think there are a fair few, and to make matters worse, no
'open-sourceness' is forced. I don't want to debate the whole
ideological thing** but the fact that you can't peek at the source for
the compiled components will make it harder to search it. I mean, right
now I'm certain that there is no way to do that, and I'm thinking that
making such a way exist for extensions would be a 'hard' problem.

-- Gijs

** so please, no replies from whoever else reads this concerning that,
make a different topic in a more relevant group iff you absolutely must...