> This doesn't make any difference. All websites were already blocked.
> Autoplaying is only happening on the nytimes.com site (of the ones I visit).
> Any suggestions?

Fred,

I found this blog post + discussion:

https://utcc.utoronto.ca/~cks/space/blog/web/FirefoxMediaAutoplaySettingsIV
https://news.ycombinator.com/item?id=39873169

Sounds like there are more complex autoplay settings under the hood as well, overriding this behavior once you have interacted with a tab: https://wiki.mozilla.org/Media/block-autoplay

At a quick glance, I didn't really make sense of it.

Alternatively, you might be interested in this feature of uBlock Origin, which allows media elements over a size you can set to be blocked by default:

https://github.com/gorhill/uBlock/wiki/Per-site-switches#no-large-media-elements

Seems like many have had to resort to that. It might not be a one click to play on the element itself, but there should be a relatively simple workflow to toggle it off in uBlock's interface as needed.

Best,

~rts