You can also try these related scripts:

• Fast_Add_Cart - Add to cart without redirect to cart page, also provide import/export cart feature.
• Useful buttons | Steam - Adds SteamDB, Pirate sites and other buttons to the game page.
• Steam Badge Helper - Add various features to Steam focus on Trading Cards and Badges
• Steam: add HowLongToBeat link - Adds a link to search for the game's playtime on HowLongToBeat
• Steam_Discount_Query - Query when the discounts expired