Allow or block media autoplay in Firefox https://support.mozilla.org/en-US/kb/block-autoplay

Try these settings in about:config. media.autoplay.default = 5 media.autoplay.block-event.enabled = true media.block-autoplay-until-in-foreground = false media.autoplay.allow-extension-background-pages = false media.autoplay.blocking_policy = 2

I'm still unable to block media autoplay, even after changing to the recommended settings through about:config. After each Firefox update, more and more sites are able to subvert the autoplay block. Common sites are Yahoo News and The Hill, along with numerous state and local news sites.

I have a link to a local Yahoo news site. Can you provide the url of the one you are using?