いつも使っています。保存するのに早くて確実、おすすめです。

ok

It fails sometimes, but is a great AddOn, only needs a little more polishing :D

Best video downloader I've ever used, works everywhere. May find more than 1 resolution video on page or more than one video, use the video play time to make sure you get the right one.
Update: taking one star away because now, in latest upgrade, seems when a download fails, it gives an error to send a report, BUT DOESN'T TELL THE USER WHICH DOWNLOAD FAILED! It used ti do that when it was just a dropdown from the bar.