What do I use for a wildcard when setting popup exceptions?

I have created an autoconfig file for my organizations firefox users which helps set settings like our popup blocker and allowing exceptions. I was wondering what i can use to allow popups for an entire domain without having to type each possible individual site. Is this possible? If so, how do you type it out? I have tried: *.mydomain.com [*.]mydomain.com Thanks for your time!!