This is an extension to make it easier for you to determine which games in your Steam library are on the Humble Bundle as it grays out & highlights your already owned and wishlisted Steam games on Humble Bundle. It uses your Steam ID (or profile name) as the identifier to find all the games you own and wishlisted. It supports all of the current Humble Bundle's offerings, including the Indie Bundle, the Limited Edition, the Collector's Edition, the Game of the Year, and the Ultimate Game of the Year.