Does not work on Youtube Rated 1 out of 5 stars
Generates a download button, but the link does nothing.This review is for a previous version of the add-on (22.214.171.124.1-signed.1-signed).
I released an update (version 1.3.3) that might fix your problem. It is still in the review queue for Mozilla Add-ons, so it won't be released here for about a month, but if you want to install it right away you can install it from: http://jhartz.github.io/mp4downloader/download.html
If you continue to have problems, please contact us directly: http://jhartz.github.io/mp4downloader/contact.html
Jake (MP4 Downloader author)