How to change the default app in firefox?

[Daniel Lombraña González]

This is my question. Well for example when I want to open a pdf, by
default tries to open it with xpdf, but I want Evince.

Another example, when I click on a video link, totem is the default app,
but I want mplayer.

Any suggestion?

Im in breezy.

Thanks in advance.
-- 
La indigestión es la encargada de predicar la moral al estómago.
		-- Victor Hugo. (1802-1885) Novelista francés. 
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Puedes encontrar mi firma pública en:
http://pgp.rediris.es:11371/pks/lookup?op=get&search=0x8D6CAE34
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You can find me public key in:
http://pgp.rediris.es:11371/pks/lookup?op=get&search=0x8D6CAE34
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Por favor, NO utilice formatos de archivo propietarios para el
intercambio de documentos, como DOC y XLS, sino HTML, RTF, TXT, CSV 
o cualquier otro que no obligue a utilizar un programa de un 
fabricante concreto para tratar la información contenida en él.
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http://barrapunto.com/~Teleyinex/bitacora
http://www.flickr.com/photos/teleyinex
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