starting with update 49 got strange was unpredictable as to what it might do all kinds like what you type is not what it puts on the screen audio and video problems. update 54 video gone update 56 sound gone.
if someone told me this i would say it is impossible keft a log for a while of questions i asked on thier site 430+ over 30000 anwsers they have 100% failure rate not one correct anwser its looks like i need to by a lottery ticket if this was one machine i would say its the machine . however i have 4 macs and a couple of pcs does not bother the pcs only the macs i have removed and reinstalled the OS what ever it is doing its not quickly it takes about 3 days to get like the others makes me think its not 1 bug but a combination of bugs. OS X 10.11.6 AND 10.12.3 WATERFOX IS OK JUST NOT AS GOOD AS FIREFOX USED TO BE. LOST WITHOUT A CULE