Anyone know how to solve this iframe problem?

Hello guys, please help me,
I try to put some iframe codes into my website and then try to load it.
It is successfully done by chrome and internet explorer. Unfortunately, when I use firefox, one of the "sub domain" inside the iframes just pop out and there is no longer iframe in the firefox tab, instead, it redirects it the the site inside the iframes.
My question is, do you guys have any code to put so that the iframes also work well in firefox?

See original post by reed265