testusername said

try contating Samsung maybe?

The problem is Mozilla not Samsung.

What exactly are you trying to download. Can you give a link to the page that contains the download link please.

P.S. I did find a site

• http://www.samsung.com/us/smart-switch/
  • With link http://www.samsung.com/us/smart-switch/assets/downloads/Smart%20Switch%20PC_setup.exe
    (I made the link none clickable it will paste)

Are you sure you are using Firefox and not Internet Explorer ?

hi, this error message is coming form windows and nor from firefox, so you'd need to look for a solution there... see http://www.technicalnotes.org/fix-this-publisher-has-been-blocked-from-running-software-on-your-machine-in-windows-10/ for example