Hello sameeker, You must have seen some old directions ..... Would you please do this : Type in the address bar '''about:config''' and press Enter (promise to be careful, if asked) Type in the search bar : '''media.autoplay.enabled''' and set its value to '''false''' and : '''media.block-autoplay-until-in-foreground''' and set its value to '''true''' Then close and restart Firefox. Also see : https://www.howtogeek.com/341690/how-to-prevent-videos-from-autoplaying-in-firefox/