https://www.cnet.com/news/firefox-users-finally-get-option-to-block-autoplay-video-audio/

            Firefox
     users are finally getting the option to block the video and audio that frequently begins playing automatically when you visit websites, something already offered on 
            Apple's
     Safari and Google's Chrome browsers.

> The option was added over the weekend to Firefox Nightly, the latest test version of Mozilla's popular web browser, asking users by default whether they want to allow a website to autoplay video with sound. Users also have the option to go into their preferences and block all sites' autoplay ability if they don't want to deal with it for each site they visit.