Opening a fixed mini player automatically is a feature offered by the website and is created via JavaScript if the main player is scrolled out of view. A lot of websites now have a fixed (pop-up) mini player in one the corners once you start playing a video that stays visible if you scroll the page. This website mini player shouldn't be confused with the Firefox PiP (picture-in-picture) feature (you likely see the Firefox PiP icon if you hover the mini player).

You can look at these prefs on the about:config page to see what settings work for you to block autoplay.

• media.autoplay.default = 5 [0:allow;1:blockAudible;5:blockAll]
• media.autoplay.blocking_policy = 2
• media.autoplay.allow-extension-background-pages = false
• media.autoplay.block-event.enabled = true
• media.block-autoplay-until-in-foreground

You can open the about:config page via the location/address bar. You can accept the warning and click "I accept the risk!" to continue.

• https://support.mozilla.org/en-US/kb/about-config-editor-firefox

Thank you! I have used about:config to tweak Firefox the way I want it, but wasn't aware of media autoplay options. I followed your recommendation and my problem is solved. Appreciate your help.

What, exactly, in about:config did you change to stop these stupid miniplayer things. I also find them SUPER annoying and this is the first I've found that explains it's not firefox, it's the stupid web designers. I guess a lot of folks do like this miniplayer thing but to me it's just plain distracting besides just being annoying. Thanks.

This is what I did in about:config and it has worked for me:

media.autoplay.default = 5 media.autoplay.blocking_policy = 2 media.autoplay.allow-extension-background-pages = false media.autoplay.block-event.enabled = true media.block-autoplay-until-in-foreground = false