"a blow by blow instructional,for the lesser anointed peasants" !
Click the menu button
and choose Options.
Click the panel.
Click the tab. The update options are displayed
Uncheck the box next to Use a background service to install updates.
Close the Options window.
[ When Firefox or Thunderbird downloads an application update, the Mozilla
Maintenance Service gets permission from Windows to allow the update to
be applied, without requiring you to click Yes in the Windows User Account Control].
Simple enough for you ?