Потому что удобное

Now this is really a nice add-on. I mainly use it on VK (currently the only one that works, afaik) and Youtube, never let me down :) RESPECT!! Doesn`t open any naggy popup window, no ads, no nothing (although I wonder what data it reports back :D)

很好，太方便了。好喜欢哟！非常的好。

手机上非常好用！

Супер
Пользуюсь спасибо

Отлично

The only one I've found that supports m.youtube.com

Хорошое расшерение

Excellent addon. It allows to download videos in many file types

Es la mejor