No. Just no.
Domain registrar info is a proxy, nothing more. That Whois lookup tells us nothing about the identity of who actually owns the domain.
Loopnet (costar) was just the service used to see lease info.
The ones posted yesterday are safe, no external dependencies.
Damn browser plugin uses jquery, which exposes one to unintended fuckery (and bloated performance).
Not a bv, just a codefag. Happy to help.