Like other top-rated addons in this genre, you cannot download YouTube videos in an MP3 format without paying money.

It is NOT free for all downloads.

Installed.
Tried to download some video as mp3.
YOU MUST BE A PRO USER.
Uninstalled.

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Terrible UI, sketchy website, and requires payment to download at 1080p. Giving your payment information to this scam of an add-on is basically begging to be robbed.

Worked for awhile but then it just stopped. Was instructed to wait till the issue could be fixed... now it is supposed to work, but it still doesn't... waste of time & $$

the author got greedy...no longer able to download mp3 unless u donate

This is a switch bait scheme. You won't be able to download in proper HD formats unless you cough up some cash first. They explain how you "need powerful server infrastructure" to actually download in HD and how it's "limited to PRO users only". There are literally TONS of other Firefox addons that do the same job better, and for free. My suggestion to the developers is to find a real job. Makes you wonder why Mozilla is recommending this addon.

Does not work at all.

devi diventare PRO per potere scaricare un MP3

Сначала платите, потом скачивайте. Удалил.
Pay first, then download. Deleted.

doesn't work, you need to pay, lol yeah right. there are better websites to download from anyways, and in higher quality. 0/10

Doesnt work as advertised, 360p only.

This junk extension doesn't deliver 80% of what it promises unless you buy a pro package

MP3 option does not work.

Gave a $15 donation after joining because I was getting 1040p downloads. A few weeks later I could not even download 780p with the following message that I need "pro":
Youtube switched to separate audio/video streaming technology for higher quality formats and no longer provides direct 720p (Since 24 September 2018)/1080p/mp3 streams. Converting these streams to downloadable formats for you needs powerful server infrastructure, therefore 1080p/mp3 downloading has been limited to PRO users. Read more at - https://videodroid.org/pro_upgrade.html. FREE users can download all formats in CACHE where some PRO users fetched the video/audio in past 24 hours, to test the feature you can try downloading popular videos.