Open links in new tab in Firefox?

[Gustavo Seabra]

Hi,

How can I configure Firefox so that it will  open a link in a new tab 
instead of a new window? I  already have this option selected in the 
Firefox preferences --> Advanced --> Tabbed browsing -->
   "Open links from other applications in:"
        ...
        "a new tab in the most recent window.",
but when I click on a link in Thunderbird, it always opens a new Firefox 
window. Is there anywhere else I should change?
I'm using:
    FC3
    KDE
    Firefox 1.0
    Thunderbird 0.9

Thanks,

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Gustavo Seabra - Graduate Student
Chemistry Department
Kansas State University
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