You can also try these related scripts:

• Steam Bundle Sites Extension - A steam bundle sites' tool kits.
• The Redeemer - Pops up the Steam product activation dialog when copying keys from bundle/reseller sites. Supports various bundle organizers and legitimate key resellers.
• Bundle Helper - Add tools for many bundle sites.
• Bundle Helper - Highlights games you already own on Steam, on other sites. Modified from https://greasyfork.org/scripts/16105-bundle-helper/
• Show Steam Cards for DIG Game Bundles - Shows a Emoji depending on Cards Status and Region Lock