Well, I don’t care for the new “embed your game directly into the game page” feature.
What happens, I like to browse for games that look interesting to play, and then open each game’s page in a new tab. With a game playing in a tab, suddenly I have a lot of resources going to running the game in a browser tab I’m not even focused on, and also audio playing in multiple tabs, probably with no quick/easy way to mute it.
This could be fixed fairly easily by including a “play embedded” button for games that use the embed in page feature, and then don’t actually start running the game until the button is clicked.