I had a hard time downloading videos before, using Video DownloadHelper. Downloads were slow (mostly from Vimeo) and failed often. I got this because VDH kept erroring out after finishing the full multi-gig download. This addon downloads every video at the max my connection will allow, over 200 mbit, and works every time. The video list seems like an interesting idea but doesn't seem to work for me. Also, this addon doesn't seem to pick up the 1080p versions of the videos I want to download, while VDH did (but it failed to download them, calling them "corrupt", so the 1080p videos may have been the problem).