After this task, Firefox will use a service to execute updates so that UAC prompts are not displayed.
The service is an on demand service and will remain stopped until it is needed, when it is needed it will be started again for the period of the update.
The task related to creating a service and not prompting the user for UAC is in [https://bugzilla.mozilla.org/show_bug.cgi?id=481815 bug 481815].