at high video speeds, chromium plays sound smoothly, and firefox - trembling. i can't describe it, you have to hear it yourself. i attach the picture of sound produced by both in close comparison in audacity. in firefox, the higher speed you make, the harder it is to understand what are people talking about. in chromium, the speed increases but the sound stays smooth and it is easy to recognize words. this is the main reason why i don't use firefox and use chromium instead, thus decrease firefox browser market share which is now below 5% according to statcounter my os is ubuntu 18.10