Sometimes processes videos to MP3 format a bit slow and occasionally downloads a blank .mp3 file repeatedly. With all the extensions I have that might be on my end. :)
Had trouble with it staying activated and lost my confirmation link. 2nd time I contacted the dev I got another one and didn't even see it inside the reply so I complained some more. I am the idiot here. :)

非常好用，我的浏览器重装以后不能下载1020P了，一封邮件，三个小时就搞定了，赞！

I think that "Best Youtube Video Downloader" for me. thank you so much ;D

It's working for me. Thank you!

Works great. Easy to use. Much faster than the other downloader that I tried.

works every time with zero video loss.

Works great!

Love this apphavent had any issues with it I always get my fav music and videos for use off line

Great addon.

I've been using this add-on for a while and it is excellent. I can use it easily, its reliable - I totally recommend it!

Outstanding! This extension has cured all of my video download headaches. In my location there's only one choice for broadband and speeds are very inconsistent so downloading video to watch offline is a must. I became a Pro member to get access to higher quality video downloads and have no regrets. If you're using this extension, make a donation to the developer, who has created one of the best FF extensions ever!