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Microsoft is testing a new in-game browser
It requires setting the beta Edge browser as your default.
The “game-aware” overlay lives in the Microsoft Game Bar and is designed to automatically find and show you links to tips and guides for the game you’re playing, using the Edge browser. Game Assist is currently available in English, and you’ll need to opt into the preview and set Microsoft Edge Beta 132 as your default browser to use it. Game Assist requires the Beta or Preview channel of Microsoft Edge.
Or read this on The Verge