Howto configure external applications for iceweasel

[Johannes Wiedersich <johannes@physik.blm.tu-muenchen.de>]

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Is there a 'proper' way of configuring external applications for
iceweasel (lenny, 3.0.5)?

I am downloading a *.bib file and would like to open it with 'kate -u'.
Iceweasel insists on opening it with 'jabref (default)'.

I can't set it in Preferences --> Applications, because there is no
entry for bib or jabref.

Thanks,

Johannes
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