Delivery of Addon and autoupdate to limited set of internal user

Hi,
We are using Firefox as our default browser across our organization.
We are developing a addon on Firefox which will be used by users
within our company.
Once we make the addon, we would want to push it to these users (either
through a web page or any other possible method) and automatically
update Firefox.
Note that if a user doesnt have the addon, it should
automatically update it. If he already has the addon installed, it
should update the addon if applicable.
If there a way we can achieve this? is there a feature in Firefox to automatically do this?
We really appreciate your help.

CCK2 might be able to do what you want.