trusting .deb packages

[Anil Duggirala]

I am thinking about installing the Mega.nz app on my Debian Stretch 
installation. They provide a .deb package. Is there anything I can do to ensure 
this is a safe package? To know that this package will not create a security 
vulnerability on my system? What is the minimum security procedure to follow 
when installing third party provided .deb packages?
thanks,