Instaling addon facebook chat history manager on a refreshed 6.02 firefox installation sais that this addon has been disable by the administrator. how can i enable it?

after reinstaling the firefox browser i have the following information when attempt to install facebook chat history manager addon:
This addon has been disabled by the administrator (something like that).

If you lock a pref then it is impossible to change such a pref on the <b>about:config</b> page.
*http://kb.mozillazine.org/network.proxy.type
*http://kb.mozillazine.org/network.proxy.%28protocol%29
*http://kb.mozillazine.org/network.proxy.%28protocol%29_port
You can compare a copy of prefs.js before and after having changed a setting to see which pref(s) to lock.

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    Contact iTunes Customer Service and request assistance...
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