I just found this tip on ubuntuforums.org which works for me:
http://ubuntuforums.org/showpost.php?p=8681086postcount=2
alt f2 launch run box
gconf-editor
Then navigate the tree to ( / apps nautilus preferences )
Make sure you have preferences clicked on.
Then on the right scroll down to
This seems to be a new behaviour since the last update. I saw this
dialog for the first time today.
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Passive dialog is not passive
https://bugs.launchpad.net/bugs/456593
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ubuntu-bugs
On my Jaunty system the prism-google-mail app works as expected.
External links open in the real firefox. But in Karmic external links
open in a new prism window.
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External links should open in external web browser
https://bugs.launchpad.net/bugs/224849
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