Hello, Reinstall the extension after an older version is uninstalled. The current version is 7.49:

http://download.sf-helper.com/mozilla/helper_last.html

Hello! Our help will be more effective, if you copy and send us info about your browser and the Savefrom.Net extension:
http://en.savefrom.net/user.php?info=1
We'd also need some links you can't download (to test them).
For the better understanding it'll be great to see a screenshot with the error. 

Do you download via the extension SaveFrom.net Helper or the website SaveFrom.net?
We are waiting for your reply, and thank you for contacting us Savefrom.net Team!

¡Hola! Nuestra ayuda será más efectiva si copia y nos envía información sobre su navegador y de la extensión Savefrom.Net:

http://es.savefrom.net/user.php?info=1

También necesitamos algunos links que no pueda descargar (para probarlos).

Para tener mayor idea del problema, será de gran ayuda ver una captura de pantalla en donde se muestre el error.

Esperamos su respuesta, ¡gracias por ponerse en contacto con nuestro equipo Savefrom.net!

Hello, this site is not on the list of supported resources. The full list can be found here: http://en.savefrom.net

Please, use our extension Video Downloader Pro: http://videodownloaderpro.net 
Possibly, it will download from the website you want.

Hello, update your browser to the current version 56.

Hello! Our help will be more effective, if you copy and send us info about your browser and the Savefrom.Net extension:
http://en.savefrom.net/user.php?info=1
We'd also need some links you can't download (to test them).
For the better understanding it'll be great to see a screenshot with the error.
We are waiting for your reply, and thank you for contacting us Savefrom.net Team!

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

Hello! Our help will be more effective, if you copy and send us info about your browser and the Savefrom.Net extension:
http://en.savefrom.net/user.php?info=1
We'd also need some links you can't download (to test them).
For the better understanding it'll be great to see a screenshot with the error.
We are waiting for your reply, and thank you for contacting us Savefrom.net Team!

Hello, this problem has been solved. 

Hello! Our help will be more effective, if you copy and send us info about your browser and the Savefrom.Net extension:
http://en.savefrom.net/user.php?info=1
We'd also need some links you can't download (to test them).
For the better understanding it'll be great to see a screenshot with the error. 

Do you download via the extension SaveFrom.net Helper or the website SaveFrom.net?
We are waiting for your reply, and thank you for contacting us Savefrom.net Team!