IMDb Plus is a Firefox add-on designed to enhance the user experience on IMDb through a collection of GreaseMonkey scripts. This subscription-based tool offers several user-defined enhancements, ensuring a more informative and visually appealing browsing experience. Key features include the ability to display larger thumbnail images in various widths, the addition of age information next to a person's date of birth, and the display of weekly average gross earnings on the US Box Office page.

The add-on is particularly useful for users with JavaScript disabled, as it improves the visibility of images and allows all collapsed sections to be shown. Each enhancement can be individually enabled or disabled, providing users with customizable control over their IMDb viewing experience. IMDb Plus is optimized for Firefox on Windows, but user feedback is welcomed regarding its performance on other platforms.