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Open Firefox. Go to the menu bar (top left hand corner)> Click Tools>Options>Content. Untick where it says Block Pop Ups, and leave all the other boxes ticked.
Hope this helps.
Please let us know if this did the trick
Yes ... yes it did :)
Alternate - just allow pop-up rights to the site being suppressed ( www.ustream.tv). It works - and I managed to get FF toask me if I wanted to let the pop-up go through once. IE 7 does the same - and the solution is the same too.
I'm curious about why we needed to do this at all. It's not a pop-up (at least, not as i understand pop-ups) that opens a new tab / window.
Still, it works and it's yet another neato trick to store away for future reference.
Cool :) Doubt we will hear from the original poster though ...
Remember to mark this as solved…glad it worked out for you 
Thanks guys =3