Safari has it and is doing it much better, because it blocks both video and audio autoplay. I just tested it on Firefox 66 and I'm very disappointed. It blocks

Safari has it and is doing it much better, because it blocks both video and audio autoplay. I just tested it on Firefox 66 and I'm very disappointed. It blocks only audio and... it's broken anyway. On one page the first video was audio muted (great!), but then the second video came after the first one finished playing and it was suddenly unmuted! The tab was inactive and suddenly the sound came from it. Until fixed, I'm still going to use Safari for this solely reason.