SteamProfilePreviewer is a Firefox extension designed to enhance your Steam profile experience. This subscription-based tool allows users to preview items available in the Steam Points Shop, making it easier to select items that complement their profile. Users can click 'Preview' on any item, which will display a preview in a sidebar menu. This feature simplifies decision-making before making purchases, ensuring that the selected items align with personal preferences.

The extension supports various items, including animated, static, and tiled backgrounds, avatar pictures, avatar borders, and mini profile backgrounds. Additionally, users can enter a profile link to preview items without logging in, allowing for the customization of friends’ profiles as well. However, users should be aware that changes on the Steam website may affect the functionality of the extension.