This might work Rated 4 out of 5 stars

Hi!
Instead of - replace 'watch-headline-user-info' with 'watch7-secondary-actions'
Change it to: 'watch7-subscription-container '
It worked for me! :-)
/FoxFixer

This review is for a previous version of the add-on (1.0.4.1-signed.1-signed). 

Rated 1 out of 5 stars

No funciona / Doesn´t work :(

This review is for a previous version of the add-on (1.0.4.1-signed.1-signed). 

why this review is always removed after few days? Rated 4 out of 5 stars

Very good addon.
This is the fix if you don't see the button.

Windows:
- search for info@youtube-mp3.org.xpi (or something like that) in your firefox profile folder
- change the extension from xpi to zip
- open the archive (for example with 7zip)
- search for ytmp3.js inside the archive
- open it with notepad
- replace 'watch-headline-user-info' with 'watch7-secondary-actions'
- save and close notepad
- close the zip archive
- change the extension from zip to xpi

Linux:
- search for ytmp3.js in your firefox profile folder
- open it with a text editor
- replace 'watch-headline-user-info' with 'watch7-secondary-actions'
- Save and close

Now the Download MP3 button will appear under the hit counter

This review is for a previous version of the add-on (1.0.4.1-signed.1-signed). 

Download button Mac Rated 5 out of 5 stars

Nice the Linux fix works for Mac. Firefox>help>troubleshooting information>show in finder>look for ytmp3.js

This review is for a previous version of the add-on (1.0.4.1-signed.1-signed). 

Unfortunately not funktening! Rated 1 out of 5 stars

Download-Button does not appear - after installtion and renewal of the youtube site.
Too bad! Looked nice and simple.

This review is for a previous version of the add-on (1.0.4.1-signed.1-signed). 

no results Rated 3 out of 5 stars

in which folder this ytmp3.js ? i cant find it.

This review is for a previous version of the add-on (1.0.4.1-signed.1-signed). 

BROKEN! Rated 1 out of 5 stars

BROKEN!

This review is for a previous version of the add-on (1.0.4.1-signed.1-signed). 

Rated 5 out of 5 stars

As others have said, new youtube design made the button disappear. I would really love it if the dev would fix this. Best youtube to mp3 add there is!

This review is for a previous version of the add-on (1.0.4.1-signed.1-signed). 

Update Please. Rated 3 out of 5 stars

Download button doesn't show with the new youtube design. Have to visit website separately to convert and download mp3s. Update please or somebody suggest a work around for this in new youtube.

This review is for a previous version of the add-on (1.0.4.1-signed.1-signed). 

Don't blame the developer Rated 5 out of 5 stars

The button is absent on the recently updated Youtube design. It is the new design of their webpage that is the problem and not this add-on's fault. You will notice that other mp3 downloaded add-ons are also suffering the same problems. I'm sure that there is a real possibility that there will be a subsequent update for this add-on to take into account the Youtube design change.
Prior to the recent alteration, this add-on worked perfectly and seamlessly. Perhaps if people did a little detective work they wouldn't make such rash assumptions and always blame the add-on.

This review is for a previous version of the add-on (1.0.4.1-signed.1-signed). 

NO button Rated 1 out of 5 stars

well, what can I say, no button hence I can't use it.. (FF 17.0.1)

This review is for a previous version of the add-on (1.0.4.1-signed.1-signed). 

Rated 5 out of 5 stars

Button is right up there above the video. Look carefully. Works great. Tested on FF 17! Thanks for this addon.

This review is for a previous version of the add-on (1.0.4.1-signed.1-signed). 

Update!!! Rated 4 out of 5 stars

I give it four because everyone else gives it good reviews.
It's just that the button doesn't show in the new youtube or it is some other bug. I can't see it anywhere anyways!

This review is for a previous version of the add-on (1.0.4.1-signed.1-signed). 

Rated 4 out of 5 stars

It just does what it says, it's a nice extension.Note to the author: change the button CSS class from "yt-uix-button yt-uix-tooltip" to "yt-uix-button yt-uix-button-default" in ytmp3.js to make it look native in the new youtube style ;)

This review is for a previous version of the add-on (1.0.4.1-signed.1-signed). 

great! it works again Rated 5 out of 5 stars

The best addon to convert youtube's videos in mp3.

This review is for a previous version of the add-on (1.0.4.1-signed.1-signed).  This user has a previous review of this add-on.

stopped working! Rated 3 out of 5 stars

great add-on, have used for so long, but installed in a new mac and seems not be working, installed successfully, but the button doesn't show up, what happened?

This review is for a previous version of the add-on (1.0.4.1-signed.1-signed). 

Rated 1 out of 5 stars

Doesn't work. Leads to a petition site.

This review is for a previous version of the add-on (1.0.4.1-signed.1-signed). 

Rated 5 out of 5 stars

good

This review is for a previous version of the add-on (1.0.4.1-signed.1-signed). 

Rated 5 out of 5 stars

good

This review is for a previous version of the add-on (1.0.4.1-signed.1-signed). 

Rated 2 out of 5 stars

Seems to work, however screen shots do not show the popup tab that opens linking to the conversion site. No quality selector. So so, and a little misleading.

This review is for a previous version of the add-on (1.0.4.1-signed.1-signed).