Rather than having the simplejson dependency in mozinfo, we fall be to some black magic: http://mxr.mozilla.org/mozilla-central/source/build/mozinfo.py#181 Other current python modules and future python extensions could also benefit -- and in the case of the latter, require -- simplejson. Note that simplejson is obseleted in python 2.6 by the core json module, so if python 2.6 was a build requirement we could omit simplejson entirely.

This is now done: http://hg.mozilla.org/mozilla-central/rev/6133c00430fc