It's this: https://gaming.stackexchange.com/questions/28415/is-there-a-way-to-turn-off-the-ad-popup-that-appears-when-you-close-a-steam-game https://gaming.stac

It's this: https://gaming.stackexchange.com/questions/28415/is-there-a-way-to-turn-off-the-ad-popup-that-appears-when-you-close-a-steam-game https://gaming.stackexchange.com/questions/28415/is-there-a-... And it was/is default on.