It´s ok but sometimes stops working Rated 4 out of 5 stars
This downloader addon is quite useful not only for video. It also gets often updated to keep up with anti-download mechanisms of the sites.
What its not so good that it sometimes stops working and only 0 byte files are downloaded. Then you have to clean the Firefox cache and cookies.
It also cripples the titles - I don´t want them shortened.
But overall one of the better downloaders.