What does “WFM” mean?
WFM stands for “Works for me” and means “I don’t see this bug at all” or “I don’t see this bug any more”. (The WORKSFORME resolution in Bugzilla has the added meaning that nobody knows what checkin fixed the bug; if the checkin is known, the bug is marked as FIXED instead.) Some people also use “WFM” to describe a build, meaning that they haven’t noticed any major problems with a new build.