Its standout feature was the ability to handle HLS, the standard for modern streaming. HLS breaks a video into many small segments, making it impossible to download with a single request. The MPMux extension could intelligently detect these segments, download them all, and merge them into a single MP4 file on your disk, which is an extremely powerful capability.
: Uses multiple threads to speed up the fetching of video segments. Privacy Focused Video Downloader Professional Plus - Mpmux Firefox
: Can "record" a video directly from the browser's playback cache if a direct download link is hidden or encrypted. Concurrent Downloads Its standout feature was the ability to handle
: If no video is found, click "Recording Mode," then play the video. The extension will capture the data as it buffers. ⚠️ Important Limitations YouTube Restrictions : Uses multiple threads to speed up the
Limitations
The removal did not go unnoticed. Users across various forums and review sites expressed frustration over the disappearance, with many citing unresolved bugs and security fears that likely contributed to its removal. Reviews on the Firefox Add‑ons Store included complaints like “All it provides are tiny ‘video’ files, none of which are the actual video” and allegations of the extension being “a scam and stealing data”.
Video Downloader Professional Plus - MPMux (often referred to simply as MPMux) is a specialized browser extension for Firefox designed to capture and download various online video formats. Unlike standard downloaders, it is particularly effective at handling modern streaming protocols. Key Features of MPMux Streaming Support : Captures streaming videos like