Hello, in order to help you better I need the following information.
Please, send me the information listed here: http://en.savefrom.net/user.php?info=1

Do you download via the extension SaveFrom.net Helper or the website SaveFrom.net?

Hello, in order to help you better I need the following information.
Please, send me the information listed here: http://en.savefrom.net/user.php?info=1

In what capacity do you download?

Hello, Reinstall the extension after an older version is uninstalled. The current version is 7.58:

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

Quite right, we have no other way.
You have a problem with saving a video, an extension or a site. Savefrom.Net provides a download link, downloads a browser, the reason is in it.

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!

We did not find an error, the video is downloaded.

You can install the Savefrom extension: http://en.savefrom.net/user.php#helper_install

Could you please send a few links you can't download. We will check it out.

Please, send me the information listed here: http://en.savefrom.net/user.php?info=1

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

Hello, after showing the playback, click on the video with the right button and save as.

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

Hola, para una ayuda más efectiva, necesitamos la siguiente información.
Por favor copie y envíe la información indicada aquí: http://es.savefrom.net/user.php?info=1