To expound on what :glandium said:
Extensions can lock preferences with:
Components.classes["@mozilla.org/preferences-service;1"]
.getService(Components.interfaces.nsIPrefService)
.getBranch(null)
.lockPref("name_of_pref");
Locking a preference doesn't affect the value, it just locks the
preference to the user. Obviously any extension could unlock a
preference and do what they want with that value.
Locking preferences is not for the benefit of preventing other
extensions from messing with things, it's to keep users from messing
with things.
Oddly, this document:
https://developer.mozilla.org/en-
US/docs/Mozilla/Preferences/A_brief_guide_to_Mozilla_preferences
Says we already support lockPref in JS files?
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https://bugs.launchpad.net/bugs/623844
Title:
lockpref not honored in /etc/thunderbird/pref/thunderbird.js
Status in Mozilla Thunderbird:
Fix Released
Status in thunderbird package in Ubuntu:
New
Bug description:
Binary package hint: thunderbird
appended /etc/thunderbird/pref/thunderbird.js with the following line:
lockpref("app.update.enabled", false);
When starting Thunderbird and checking the config app.update.enabled
is set to false, but can be edited by the user.
ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: thunderbird 3.0.6+build2+nobinonly-0ubuntu0.10.04.1
ProcVersionSignature: Ubuntu 2.6.32-24.39-generic 2.6.32.15+drm33.5
Uname: Linux 2.6.32-24-generic x86_64
Architecture: amd64
Date: Wed Aug 25 09:58:43 2010
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release amd64 (20100429)
ProcEnviron:
PATH=(custom, no user)
LANG=de_DE.utf8
SHELL=/bin/bash
SourcePackage: thunderbird
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