Beginning with the upcoming release of Firefox 66, Firefox for Android and desktop will block auto-playing audio and video by default (Chris Pearce/Mozilla Hacks)

Chris Pearce / Mozilla Hacks:
Beginning with the upcoming release of Firefox 66, Firefox for Android and desktop will block auto-playing audio and video by default  —  Isn't it annoying when you click on a link or open a new browser tab and audible video or audio starts playing automatically?

from Techmeme http://bit.ly/2Gq1osz