Ugh. I'm using FF on Android. All the solutions I've so far found online seem to only work on the desktop version but not on my mobile. For example I tried adding the Disable HTML5 Autoplay extension, as recommended in this thread on the Mozilla forum: https://support.mozilla.org/en-US/questions/1224795 Didn't work. Btw, this is an example of a site that keeps playing video: https://www.cnet.com/news/why-some-...0-p20-pro-mate-10-pro-phones-arent-in-the-us/ On my desktop, I don't even have to do anything -- all my about:config settings are at default, and nothing plays automatically when I visit that site. On mobile, I tried changing 3 different settings that come up when searching "media.autoplay", and nothing helps so far. I have: media.autoplay.enabled: false <-- the most obvious one that should kill it media.autoplay.block-webaudio: false <-- I would be satisfied if it at least doesn't blare sound randomly... media.autoplay.ask-permission: true It looks like none of these have any impact on that stupid video on that page. Wtf is the point of these about:config things if they don't even do anything?? What else can be done? Should I just give up and switch to a different browser? Is there one that is 100% fail-safe with this? This shit is driving me nuts.