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I want to disable:

  • installing extensions

  • changing toolbar/menu layout (the best would be to disable right-click on them)

Is it possible to do this?

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It's possible, and you can even have the settings downloaded from a remote server; although right now I cannot remember any resources (might post an answer later). "Firefox lockdown" is a good keyword. – grawity Feb 20 '12 at 9:02

The Mozillazine article on Locking Preferences describes how to lock down copies of Firefox:

  1. Pick the settings you want to lock
  2. Create a lock file (e.g. lockdown.cfg) and add the Preferences you want to lock:

    lockPref("", 0);
    lockPref("some.other.preference", 1);

    You can also change the default preferences inside your file.

  3. Load the lockfile:

    "Create a new file (eg "local-settings.js") in the defaults/pref subfolder of the installation directory .. and add the following line to the bottom, which points to the newly created lock file."

    pref("general.config.obscure_value", 0);
    pref("general.config.filename", "lockdown.cfg");

  4. Save and restart Firefox

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