ok

It makes it so easy to download YouTube videos!

I used it for years

Great addon, looked a bit weird on the old layout, but i could see it hasnt been designed (Yet) for the old layout, right now i just changed the addons configuration they provided to change the style to look better and not offset other items. (Great feature btw :P)
Great addon, keep it up!

I've had this YouTube MP4 Add-on for several months and it has been working fine but after Firefox 62 came out it doesn't show up or appear to work. Hopefully this is some temporary thing.

Update 11/10/2018 - After Firefox 63.0.1 (64-bit) update this add-on doesn't work again. It is a great Add-on, hope it can/will be restored.

Update 3/19/2019 - After Firefox 66.0 (64-bit) update this add-on didn't work until I restarted my computer. It is a great add-on and I also bumped my review from 4 to 5 stars.

Update 5/3/2019 - As of this date now getting this message "YouTube MP4 Downloader could not be verified for use in Firefox and has been disabled." Hope not permanent as really like this add-on.

good job

One of the easiest and best add on for video downloads, 5 stars, i shared at Google + too. Thank you so much for your hard work and kind support for sharing it for free.

It downloads long (3hr +) videos quickly and efficiently. There's not much else you can ask for from a YouTube conversion add-on!