Great extension and works for some downloads other utilities can't do. Remember that this extension works for m3u8 streams that do not have DRM protection. Some websites use a different streaming protocol, or have implemented DRM on their streams, so don't give it a bad rating just because you're trying to download something that this extension isn't designed to do. The extension does take a bit of understanding to use properly. From what others have said, and I can tell, this extension provides partial accessibility to a service for which there are only full features through a similar extension for which there is no Firefox version.

-It needs a button to let you clear the history of previous finds. On some sites it will build a cumulative list of up to 31 possible downloads with no easy way of telling new items from previous results. To clear the list you may need to open the video site again in a new tab, or disable the extension and enable it again.

-The results are presented as the m3u8 filenames which may not be very informative in telling which ones are audio or video streams alone. Inclusion of the tab name or stream information in the list would help. There's a preview button but it's a cumbersome way to have to tell if you are selecting the correct file to download. Beware: the audio starts automatically at full volume.

-If you see an error message in a preview it may be that the file has DRM protection. I don't know if there would be a way for it to detect DRM and let you know that's the reason. Currently it just says the file is "corrupt".

-Also nice would be to have an icon indicating what kind of stream each result is. I saw one site where there was audio, video, and both. Sure, you can tell from looking at the previews but again it's a bit cumbersome.

-When you select a stream to download it will open a new tab. The bottom of the tab has a FAQ list which mentions some features that apparently this extension does not have.

This is a wrapper for the no longer running original fetchV add-on, for downloading it is as good as before but you cannot access most features and it won't remember your settings. Don't know why fetchV.net no longer supports Firefox...Since it is experimental wish it can stay.