The best add on you might have. Sometimes there's some trouble downloading Hd vids and recently low high vids, but these guys always find a solution. I'm happy to collaborate in order to upgrade my account.

good

"Only one with 1080p Full-HD and 256kbps MP3 Direct Links" - but you forgot to add in the title that you have to PAY TO DOWNLOAD IN 1080P.

When I try to download 720p files are empty - no longer valid. 15.7 fixed the problem. Still waiting for free 1080p download.

Ok firstly I should point out it worked for half a day after I made a PayPal Donation to get the PRO version in the morning then stopped working and asked me to make ANOTHER donation for the PRO version in the afternoon.
I am sure I am an exception rather than the rule and I have contacted them over the issue. I type this so others are aware there can be issues.

Having said that I now have it working again after being e-mailed an activation link following my complaint. I found the support to be be pretty good.
Had I not encountered the, albiet, temporary problem I would have given 5 stars.

Es bueno

Seems to be currently the only FF extension able to download 720p/1080p video, and only after a donation. So even though you're not required to pay, this uses the freemium model. Sucks though that the main thing I need right now for a project I'm working on is to download 480p video and I can't seem to find any program that still does that.