A good suggestion. A problem is that HTML5 video can come in many forms. OGG, H264, etc. Depending on what codec the website used. I did find more information here:https://www.ghacks.net/2018/09/21/firefox-improved-autoplay-blocking/and it makes perfect sense. It seems that clicking media.autoplay.enabled in about:config no longer works as of Firefox 63. I did find a workaround by entering media.autoplay.default and changing the default value from '0' to '1' (autoplay blocked). The videos still appear, but they don't autoplay. So until Firefox 64 comes out, it's a good solution for now. Thanks for your suggestion as it would as well.
