How do you completely disable the installation and use of add-ons for firefox 4? Is there a config setting/file that can be changed to completely disable add-ons?

I want to completley disable the installation and/or use of add-ons in Firefox 4. I don't want anybody that logs onto either of my computers to be able to use add-ons and I can't find a way to disable it in the configuration files. I've found ways to lock down other options like updates etc. but I cannot find a way to completely disable add-ons.

See:
* http://kb.mozillazine.org/Locking_preferences
You can use a mozilla.cfg file to lock prefs or specify default values. 
You can place a file local-settings.js in the defaults\pref folder to specify using mozilla.cfg.
You can use these functions in mozilla.cfg:
defaultPref(); // set new default value
pref(); // set pref, but allow changes
lockPref(); // lock pref, disallow changes
To prevent users from installing software use:
<pre><nowiki> //
lockPref("xpinstall.enabled" ,false);
</nowiki></pre>

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