It can be just a touch finicky at times with certain sites, but well worth it IMO for not having the autoplay video cancer happening on Gamespot and other sites that are rude enough to force spam you with videos while you're browsing rather than politely presenting videos and letting you click on the ones that actually interest you.
this has been complained about for years and gamestop still refused to stop it, it gotten so bad cause other sites do this, that FF has hidden option to STOP autoplay search about:config for "media.autoplay.enabled." set it to false
chrome is gona add function to stop this too soon http://www.makeuseof.com/tag/chrome-finally-adding-autoplay-video-blocking-ability-mute-entire-sites/ and i bet when these function become on be defualt gamespot will cry " our setting " are breaking there site. cause such setting might break the player as noted here https://www.ghacks.net/2015/06/11/finally-mozilla-adds-working-html5-video-autoplay-blocking-to-firefox/