HLS Video Download is an extension for Firefox designed to download video files from various streaming websites. It specializes in handling HLS-based streams and single file formats, providing support for platforms like YouTube, ARD mediathek, and more. The tool allows users to download videos easily, with a straightforward interface that shows available downloads in a dropdown menu. It is important to note that the unregistered version limits downloads to 20MB, while the full version can be activated for a small fee. Users should ensure compatibility with their desired streams by testing the demo version before committing to a purchase.

The extension requires users to activate it via the toolbar and it monitors browser activity to detect available video streams. While it can download audio and video separately, users must manually merge them using external tools like ffmpeg if needed. The plugin does not function in Firefox's private windows and may encounter limitations with specific websites that employ anti-debugging techniques. Overall, HLS Video Download is a niche tool tailored for specific use cases in video downloading.