Cannot create a XPConnect extension for Firefox

[Yoric]

    Hi,
 During the last week, I have been attempting to write a XPCom object 
using JavaScript + XPConnect and Firefox 0.9.1 under Debian/testing.

So far, I have been able to create a xpi, register the Xpt (I think. At 
least, Components.interfaces.BookLibrarian is non-null) but the .js file 
containing the component and its module never seems to be invoked. I 
assume I have forgotten a step. The question is: which one ?

the structure of my .xpi is the following
Archive:  openberg.xpi
  Length     Date   Time    Name
 --------    ----   ----    ----
        0  10-15-04 21:00   chrome/
     3250  10-17-04 16:19   chrome/openberg.jar
        0  10-15-04 21:00   chrome/components/
        0  10-17-04 16:19   components/
        0  10-15-04 21:44   components/dummy
      152  10-15-04 20:40   components/BookLibrarian.xpt
     3435  10-17-04 16:24   components/BookLibrarian.js
     3435  10-17-04 16:24   components/openberg.js
      971  10-17-04 16:24   install.rdf
openberg.jar, in turn, contains
Archive:  openberg.jar
  Length     Date   Time    Name
 --------    ----   ----    ----
        0  10-17-04 15:20   content/
      525  10-14-04 19:21   content/contents.rdf
     2873  10-17-04 15:20   content/mainwindow.xul
As for openberg.js or BookLibrarian.js, these are basically copied and 
pasted from the cvs file /xpcom/sample/nsSample.js, plus additional 
alert() and a few changed names.

It turns out that this file never seems to be opened. There is no error 
or debug message neither on the terminal nor on the JS Console.

Any idea ?
Thanks,
 Yoric
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