the smoothest experience of ~20 tested similar add-ons
+ bold and clear 2-clicks interface, doesn't steal precious space on the toolbar (adding button on the page instead)
+ offers only few most appropriate formats
+ saves proper names
free version is limited to 720p mp4 (fair enough), reasonable donation unlocks hi-res and mp3 features.
worth to tell these limits clearly in the description though - to filter out hunters-for-free-beer.
recommended without doubts.

oszukuje i nie oferuje 1080p

Excellent! It's very useful, all days I download videos for illustrate my work. Thank you, an excellent work with this addon.

Where is the 1-click button you say will appear on toolbar. No button appeared on my toolbar and I can't find one anywhere. Do not tell me such a button is a feature unless it is going to be placed on my toolbar automatically during installation, or unless you give me an easy and OBVIOUS way to put the button on my toolbar by myself. In your case, you did neither. Your are a BAD BAD BAD piece of crap. Not worth anymore of my time or energy.

Doesn't download audio, wants to charge me money...

Don't know why they want to charge money to do stuff on servers when you can do it locally on the computer.

ahahaha... paid version.... :D :D :D Uninstalling...

1080p and MP3 download is only for paid version.

Needs you to pay money to download mp3's. Not mentioned in description. Not cool

It asks money to be able to download mp3.

Great tool, just the color of button... please, change it

Working great! Fast and easy!

720p only.

great stuff

FINALLY a simple to use no bog-down video D/L FF add-on, thank you! Worked for me using FF 56.0 32-bit on W7.

No longer works at all, fails the download every single time - anyone know of one that actually does work these days please?

Lie:
"Youtube switched to separate audio/video streaming technology for higher quality formats and no longer provides direct 1080p/mp3 streams. Converting these streams to downloadable formats for you needs powerful server infrastructure, therefore 1080p/mp3 downloading has been limited to PRO users."

Stream was only 720p

I know you want $$$ but it's a lie.

And IMHO 35$-$10 it's a lot for this plugin!

Uninstalling...

Best downloader for video and MP3 in high definition.
Immediate assistance in case of failure problems due to changes of youtube configuration from time to time.
Once I sent the request for assistance I immediately got the answer and I solved the problem immediately.

Thanks
Davide

Very intuitive aplication