[Bug 623844]

[Mozilla-kaply]

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

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