Flawless Rated 5 out of 5 stars

This, in my experience, has been flawless.

It currently (v. 1.6.2) works with the latest YouTube/Firefox codes, and the person who develops this add-on is pretty good in keeping up with the updates.
I've never had a problem with this one (I can't say the same for other add-ons).

Bottom line: the only downloader I've found to consistently and reliably work.

Bravo.

This review is for a previous version of the add-on (1.5.18.1-signed).