Hello, Reinstall the extension after an older version is uninstalled. The current version is 8.15:

Remove Chameleon.

https://en.savefrom.net/faq.php#ext_inst_chrome

Hello! Due to the recent youtube changes, both our website and the add-on are enable to download in 720p.
We are trying to bypass it, but with no luck yet. For now, we can recommend switching to Televzr app, that can download in 720p and higher:
https://desktop.televzr.com/#

Hello, we’d like to help you, but we will need some info about your browser and the installed extension first.
Please, go here http://en.savefrom.net/user.php?info=1
Copy the details that you see and send them back to us.
Please also send us some video links that you can’t download.
Thank you for contacting Savefrom.Net support !

Hola y gracias por contactarnos. Por favor, bríndenos algunos detalles adicionales con respecto al problema. ¡Gracias!

Hello, it's not our fault that youtube decided to get rid of 3gp . There is nothing we can do about it.

Hello, please, send us more details regarding the problem.

Hello, Unfortunately, we don't fully understand you... please. provide us with more details regarding the issue.

For the better understanding it'll be great to see a screenshot with the error.

Hello, how is the name of the program for which you paid the money?

Hello, we’d like to help you, but we will need some info about your browser and the installed extension first.
Please, go here http://en.savefrom.net/user.php?info=1
Copy the details that you see and send them back to us.
Please also send us some video links that you can’t download.
Thank you for contacting Savefrom.Net support !

Hello, in the Firefox browser you have an extension of the current version.

First, reinstall the extension from this link: http://download.sf-helper.com/mozilla/helper_last.html

Before downloading, make sure that the music you want to download is not by subscription, since we cannot download it.