I have used this addon for over 1 year Rated 5 out of 5 stars

This add-on is very heloful. But it will be perfect if it have a feature to "download" a video from firefox's cache after the whole video is played in web page, rather than download anew from youtube or niconico. It will save much bandwidth and time.

This review is for a previous version of the add-on (3.8.7.1-signed).