So I mostly love the new Firefox 57, aka Quantum, although I have a few niggles with it; my main gripe is that the LastPass plugin appears to have been totally borked.
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One other issue - autoplay videos :-(
Given that I don't use Adobe Flash, I was somewhat grumpy to find that the BBC News site was full of videos that'd start auto-playing as soon as I hit the site.
Thankfully, the internet came to the rescue - AGAIN
This takes one off to: -
which gives the usual warning: -
Once there, search for the keyword autoplay, which returns two hits: -
media.autoplay.enabled;true
media.block-autoplay-until-in-foreground;true
Contrary to the article, I double-clicked on the FIRST item, and thus changed it to: -
media.autoplay.enabled;false
Job done :-)