I would read that line roughly as "Mozilla published (source and) binaries for 32 and 64 bit x86, but ARM has been solely Mozilla publishing code and distros bu

I would read that line roughly as "Mozilla published (source and) binaries for 32 and 64 bit x86, but ARM has been solely Mozilla publishing code and distros building their own binaries". So yeah, in many ways I think this is a relatively minor change for Linux ARM users. The main place I could see it mattering is if users wanted to get binaries directly from Mozilla that's an option now, and the most likely reason I can think for that is to get bleeding edge binaries - either stable versions before the distro updates or to get beta/nightly versions that the disto doesn't ship at all.