Hi,
This addon is working perfectly for me and has been so for quite many years now. I would like to thank and reach out to the developer and recognize his/her efforts to get this addon available to the public and on top of that free. I only use the free option and 720p is quite enough for me.
I can understand users frustration when suddenly it stops working because of youtube changes. I share the same frustration, it's a measure of how nice and useful this addon is. But the best thing to di is to only let the developer know about the problem and let him/her decide if and how they can help again solve the issue. It's not for us to complain without any restraint oblivious of how much and how long the addon has been useful to us.
I read the feeling of discouragement and how disheartening some comments by angry users could be for the developer as well as his/her disappointment at the fact that happy users didn't let hear from them. So here I am. I am happy this addon exists at all and how grateful I am for the developer's efforts.

A few days ago the addon stopped again to work, again because of Youtube...and tonight I juste tried to download. And AGAIN it's working, the developer did it.

In a word, thanks. Please carry on.

Best regards,
Nico

Constant spam forcing new tabs open. If it was once a week sure, but it's at least daily.

The best downloader for Firefox, and not by a little. The operating interface is still a bit obtuse for the uninitiated; the only reason no 5th star from me.

Download speed is very fast.
It's comfortable.
　　
（ダウンロード速度がとても速い。快適です。）

It's working again!!! Lovely add-on, which i'm proud of having been one of the first users of. It functions great and I use it a lot. Love it.

Works great for me, appreciated. Dunno why it doesn't allow me to download in 720P sometimes, assuming the reasons yt and not the addon though!

It's amazing how easy you can use this programme. Works wonderfully well! Highly recomment it!

It works well, updated frequently. I highly recommend.

Beste Software-Lösung, wenn man videos aus YT herunterladen möchte. So kann man sich die Videos auch offline ansehen. Das Tool ist sehr schnell und man braucht noch nicht mal das Video abzuspielen. Hier hat Dishita eine hervorragende Arbeit geleistet.

Great YT downloader, very simple to use. The owner does his utmost to keep up with the constant changes that YT keep making. Highly recomended!

Invaluable for my projects thank you :)

Very reliable, easy to use and fast. I like that the interface is easily accessed and easy to find and use, located below the video. Once download has started, I have found that you can navigate away from the page even closing the tab of the video without interrupting the download. As long as you have a Firefox browser page open your downloads will complete. Yes, it is possible to have many downloads in progress at one time. This is an awesome tool that I have relied on for a long time. Very dependable. My sincere thanks to the developer.

It does exactly what it promotes and deserves some donations to keep up to date. I am glad that I found this.

Very sofisticated, reliable and fast

works most of the time