Hello, this is a false positive your antivirus.

We do not distribute malware.

Hello. What is your Operating System?

Install an extension from this link: https://addons.mozilla.org/ru/firefox/addon/savefromnet-helper/

Hello, SaveFrom.net team will not leave your idea without attention.

Thanks for using our SaveFrom.net Helper

Hello, in order to help you better I need the following information.
Please, let me know me the name and version of your browser and version of the extension,

all can be found using the following link: http://en.savefrom.net/user.php?info=1

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, Thanks for contacting Savefrom.Net Support.
We can make our support more effective if you provide us information about your browser and extension.
You can find out this information on this page: http://en.savefrom.net/user.php?info=1

Please, send us links for files, which can't be downloaded.

FLV is a video format which is played Flash Player. Now everything is moving to html5 player,

Hello, I do not understand, describe more fully understood.

Hello, We need some more details to be able to solve this issue.
Can you please send the information about your browser and current extension.
It all can be found here: http://en.savefrom.net/user.php?info=1

Please, send a link to a video that you downloaded.

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