As title, this happens on certain streaming site using flow player & HLS, quite frequently with recent updates, on 3 laptops 4005u, 1 desktop i3 8100 and gtx1650 and intel compute stick 6y30, all windows 10 latest & Firefox 73(only ublock origin, no other addons). The stopping point changes randomly if I close and reopen Firefox. If I click just past the stopping point, it will continue to play, until the next stop and back to start again. Back then I used to blame the bad implement from host sites and/or bad connections, but for the last few days, out of curiosity, I tried chrome and did not get a single stop like Firefox. I also tested the same streaming link (m3u8) on VLC and it played perfectly. It was like that for a year or so and I didn't care much about it, but today marks the sad day when I realized it was just Firefox and developers just let it be, for such a long time. I appreciate any help configuring firefox to fix it, if possible, but this should not happen at default. For the time being, I jumped on the chrome boat despite being a Firefox fan from version 4 or so(2006). I used to pressure everyone I know into using firefox, now I feel bad about it. I hope Firefox get better soon.