After the landing of bug 796114, the fuzzers were very active in finding issues in a particular area of IM. Now since bug 804676 landed, this code is gone on m-i, but still in mozilla-aurora. As far as I know the fuzzers aren't active on that branch, therefore the request to temporary enable fuzzing on that branch for potential bugs (related to bug 796114).
I have a mac machine fuzzing mozilla-aurora now.
Nothing bad found on mozilla-aurora for now.
Closing. The only issue found is fixed and fuzzing stopped already some time ago. Thanks gkw and decoder!