Download with Free Download Manager (FDM) is an extension designed for Firefox that enhances the downloading experience by integrating seamlessly with the Free Download Manager application. Initially, the toolbar icon is disabled, directing downloads to the browser's internal manager. However, once enabled, the extension actively monitors new downloads, rerouting them to FDM while canceling the default download process. This functionality ensures users can take full advantage of FDM's capabilities.

To utilize this extension effectively, users must have Free Download Manager installed on their system. Additionally, a small native client is required for proper communication between the extension and FDM. Instructions for installing this native client are provided upon the extension's first attempt to connect. This integration allows for a more efficient and organized downloading process, particularly beneficial for frequent downloaders.