However, we still required the ability to control some of the settings within these extensions. I was able to achieve this by creating Group Policy ADM templates for these extensions. The ADM templates are written to control the about:config settings of the extension which can be found by browsing to about:config in Firefox and filtering for the desired extension. The preferences are set at as a MACHINE CLASS (Computer Policy) and are locked preferences. Below is an example and explanation of a couple of settings of an ADM template for the IEView extension (comments in red): [Complete ADM example attached at the end of this post]

- Define the CLASS type
CLASS MACHINE

- Set the main category name (folder under Administrative Templates in Group Policy)
CATEGORY “Mozilla Advanced Options for Extensions”

- Set the preferences to be locked preferences
KEYNAME “Software\Policies\Mozilla\lockPref”

- Set the category/extension name (level under main category)
CATEGORY “IEView”

Boolean type preference for the Close Page on Reload setting (On or OFF)

- POLICY = Setting name
POLICY “Close Page on Reload”
- EXPLAIN = Explanation of what the setting does
EXPLAIN “Enables or disables the close page after reload option”
- VALUENAME = about:config Preference Name for the setting
VALUENAME “ieview.closeReloadPage”
- VALUEON = The value for the setting when enabled in Group Policy
VALUEON 1
- VALUEOFF = The value for the setting when disabled in Group Policy
VALUEOFF 0
- END POLICY = Ends the options for the current setting
END POLICY

String type preference for the Filter List setting (string of values)

- POLICY = Setting name
POLICY “Filter List”
- EXPLAIN = Explaination of what the setting does
EXPLAIN “Sets list of sites to always open in IE. Sites are separated by spaces. Use * for wildcard.”
- PART = “list” EDITTEXT, sets the values for the “list” part of the setting and edits the current vales
PART “List” EDITTEXT
- DEFAULT = When the setting is enabled in Group Policy, the DEFAULT string values will automatically be filled in
DEFAULT “file:///* http://*update.microsoft.com/ http://www.windowsupdate.com/”
- VALUENAME = about:config Preference Name for the setting
VALUENAME “ieview.forceielist”
- END PART = Ends the options for the current PART of the setting
END PART
- END POLICY = Ends the options for the current setting
END POLICY

- END CATEGORY = Ends the extension name category
END CATEGORY

- END CATEGORY = Ends the main category
END CATEGORY

I hope that made at least a little bit of sense.

Find a complete example here.
Download the RAR file here.