Not all promises work Rated 3 out of 5 stars
Sadly, it's only saving the website, but not the videos. For example on YouTube.
And yes, I am saving it as the .MAFF archive, it only creates a ~500 kb big .maff file. Even though the video player itself is being saved, but the video is not.
Only 3 Stars because it's not fullfilling everything it promises.
I confirm that Mozilla Archive Format is not able to save video and audio from websites that don't use the HTML5 specification, because every such website handles video differently. Other, more specific add-ons may be used for that purpose, because they keep a list of video websites that are handled specially. Doing that is out of the scope of the Mozilla Archive Format add-on.