[Project_owners] Error reading preferences

eric.jung at yahoo.com eric.jung at yahoo.com
Tue Apr 24 19:57:17 PDT 2007

This looks similar to an error I've seen when referencing Component.classes. In that case, it was an observer that hadn't been unregistered on a window before that window closed. Perhaps your problem is related.

----- Original Message ----
From: Onno Ekker <o.e.ekker at gmail.com>
To: project_owners at mozdev.org
Sent: Tuesday, April 24, 2007 11:22:13 AM
Subject: [Project_owners] Error reading preferences


I'm trying to read preferences in my Firefox 2.0 extension and I'm
pretty new to it, but I ran into some problems. I get a permission
denied on unnamed class exception in my Error Console. This is what I

var prefs = Components.classes["@mozilla.org/preferences-service;1"]



When it gets executed from my extension, is doesn't work:

Error: uncaught exception: Permission denied to get
property UnnamedClass.classes

When I execute the javascript straight from the chrome, it works. So
doesn't work, but

I tried putting the javasource in the .xhtml file or in a separate
chrom://errorfox/content/errorfox.js file, but that didn't make any

I tried fiddling with XPCNativewrapper setting in my chrome.manifest,
but that didn't seem to help either.

My extension is an extension for Firefox's errorpage, and the errorpage
is loaded with LOAD_BACKGROUND.

Does anyone know if that can cause my problems?

And if it does, is there a workaround?

Maybe I can try to execute this function with a timer or something?

Can code signing help me? And if it can, should I sign the javacode or
should I sign my extension?


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