Browser's should include a setting that allows users to disable autoplay on videos (and then reenable it on a site by site basis, ideally).
I appreciate that Mozilla & Google try to balance the rights/interests/integrity of websites and their developers with the interests of their end-users, to keep the web healthy, but autoplay videos are a menace IMO.
I think most people would love to be able to end autoplay on Netflix!
I'm frustrated by the number of tech headlines that have pronounced that a new version of either browser has finally truly 'blocked autoplay videos' but so far it has never been true. Mostly what they do is block the sound from autoplay videos.