Best available, handy download extension to have WHEN IT IS WORKING. YouTube doesn't want us to have the ability to download and keep certain politically incorrect videos that they eventually will delete and so YouTube "messes" with downloader codes and POOF, your green button is gone.

Best one I've found so far. Good job

es uno de los pocos que descarga MP4 con Firefox, amo esa extension.

it works great and all, but the mp4/video part stopped working it says its been disabled when i try downloading a video. UPDATE: hey when are you gonna fix this button disappeared again i love this addon but keeps disappearing and downloading is an issue and its been about well almost a week 1/2 to be exact if you can pls keep this from happening again pls and what if nobody has money to upgrade or donate to you

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it works now! before it didnt but now it does! im rating it four and not five because you have to pay for a lot of features and it doesnt always work, but its the best extension i have tried!

This extension actually works, however, It is almost impossible to locate the real downloading URL location/button because the author has liberally added adverts which look as though they would be the download URL for this (good) firefox add-on. For instance, I just received an email touting an improvement to this add-on, but was unable to locate the download url to it.
UPDATE: improvements no longer have to be downloaded, since they automatically are installed by this extension.
If you can find the URL for the Author's support email, you will actually get a response in about 3 days. My experience is that if you don't give up after receiving the first, generalized response, you will eventually be very satisfied by the author's support, e.g., it took me 4-5 emails to get exactly the information I was seeking.

Works well, except that one needs the paid version of it in order to download at decent quality.

Good extension.Thanks.

I have the free version and most of the time it works great. Sometimes it doesn't work for one reason of another, but it normally gets fixed within a week. I wonder if the pro version has the same problems? If it doesn't, I would probably pay for it. Regardless I would recommend this add-on, just try to be patient when YouTube changes its coding and the add-on needs to be updated.

Its quite but refuse to donwload sometimes

16.13 not work.the button is invisible