There is no copyright notice at the pref.xul file. How should I copyright my modified work? should I use MPL, my own copyright, or any other alternative?
You are confusing copyright and copyright licensing :-) The copyright in pref.xul is owned by whichever Mozilla contributor wrote it. There does not need to be a copyright notice of any sort for this to be the case.
However, by contributing it to Mozilla, the contributor has agreed to license it in accordance with the mozilla.org licensing policy, i.e. under a MPL/LGPL/GPL tri-license. Not all source files in the Mozilla source tree yet bear a notice to this effect; this is an ongoing process. However, you should proceed as if you are using that file under that license (see http://www.mozilla.org/MPL).
(That contributor's agreement to license their code in this way does not change the fact that they hold the copyright on it.)
So, to answer the question I think you are actually asking ;-), you should decide whether you are using the code under the MPL, LGPL or GPL and then obey the terms of the license you picked. If you have made modifications to the file to be reincorporated into Mozilla, you should license them similarly.
Gerv
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