I assumed this was because it is 64 bit, but apparently it is due to some other issue. No, after installing it 3 times, it does not appear in plugins. And of course, now that I scan down, unlike every other support forum, I have no ability to subscribe to this thread. I'm ready to delete this garbage program. I searched for 1/2 hour in google, and did encounter the question asked by someone else, but no answer had any meaning. Now that I've gotten that off my chest, ALL I FREAKIN WANNA DO IS START FF IN 32 BIT MODE, SINCE 64 IS INCOMPATIBLE WITH SIBELIUS SCORCH. Between the primitiveness of search and the complete lack of segregation of obsolete articles, I have to say that I can't think of any program with more pathetic support. Obviously help search is not sensitive to phrases. That no one even had the intelligence to segregate mac from windows help articles tells me that this is run by a bunch of jokers.
How pitiful it is to encounter supposedly potential solutions that are for versions of FF from many years ago. I will begin by saying that ff 'help' is ANYTHING but helpful.