It'd be useful for games like Skyrim or Dark Souls where you often tab out to access the wiki.
Also it'd be nice to be able to see CPU and GPU statistics like usage and temperature, cross platform since Firefox is cross platform but I'm pretty sure all of the overlays aren't.
Another really good feature would be how nvidia's windows overlay program lets you freeze the game and fly a free moving camera around the game.
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@salmander500 I think that would be better if they implement a RAM, CPU, and GPU limiter like on Opera GX. Also would be nice if they add support for Razer Chroma and other RGB SDKs like Opera GX did too.Reference image of the limiter features on Opera GX: