Simage is a Firefox WebExtension designed to streamline the process of saving images from web pages. It allows users to save images from the current tab, adjacent tabs, or all open tabs, providing flexibility in image management. Users can choose specific image sizes, dimensions, and types, and have the option to specify a custom filename or retain the original name. However, it operates within the constraints of Firefox's current download management system, which limits folder selection and duplicate file handling.

The extension's functionality is accessible through the Firefox Tools menu, context menu, or a customizable toolbar button. While it enhances image saving efficiency, users should note the limitations regarding download folder selection and the potential for duplicate file naming issues. Overall, Simage serves as a practical solution for users needing to collect images from multiple sources quickly.