Is kona.kontera.com Safe?

Allowing (temporarily) this one individually with noscript (firefox) only had the effect of adding ad's on the page (actually I saw no change on page, but number of blocked and hidden objects reported by AdBlock Plus grew higher (by several numbers). To put it's simple: This is an ad-server, and as such it's more than likely guilty of online tracking. I don't block all ads - those that are listed in Adblock Plus's acceptable ad's whitelist I allow; at least when they need no javascript to put it there. I've marked this host, kona.kontera.com as untrusted in noscript so it will never give notification of blocked scripts if they are from there.