Maybe try the iMacro plugin to write/record a macro to open the right set of pages. You might have to call the macro by hand in stead of opening the pages automatically, which means a few clicks at most. I don't think it's possible to have it test where you are.
When I fire up Firefox it opens three tabs; Google,Google and my Exchange Server Web access.
Thats all good and great when I'm at home but when I'm at university I'd like it to open Google, Uni Intranet and Uni Exchange OWA.
Is this possible? Also, when I open a new tab - can I have Google there and not just an empty tab?