The Download with JDownloader extension for Firefox enhances your downloading experience by bridging your browser with the JDownloader application. This subscription-based multimedia tool offers two primary modes: sending download jobs directly from the right-click context menu and interrupting Firefox's built-in download manager to redirect requests to JDownloader. Users can toggle the interruption mode easily via a toolbar button, which is especially useful when dealing with websites that lack direct download links.

To function correctly, this extension requires the JDownloader application to be installed on your operating system, and it can operate without a native client as long as JDownloader is running in the background. However, for full functionality, including executing native commands, installing a NodeJS native client is recommended. Recent updates have improved the extension with features like sending tab names to JDownloader and the ability to download all links at once.