Image Metadata Viewer is a Firefox extension designed for users who need to access EXIF or PNG metadata from their images quickly. By simply right-clicking on an image and selecting 'View Image Metadata', users can easily view a popup displaying all the available metadata. This tool is particularly beneficial for Stable Diffusion users, as it offers a specialized layout that organizes prompt and model parameter data in a clear and copyable format, enhancing the user experience while working with images in various UIs.

The extension is subscription-based and stands out for its ad-free interface, addressing the common frustration with similar tools that are often cluttered with ads or broken functionalities. While it currently does not support Adobe XMP tags, future updates are planned to include this feature. The developer encourages users to suggest additional features or report bugs, indicating a commitment to ongoing improvement.