The silent updater adds these system changes to XP (I assume Vista, 7 and 8 are similar):


Launched updater.exe[2648]
Low-level Drivers and Services
Registry Key hkey_local_machine\system\CurrentControlSet\services
Subkey MozillaMaintenance has been added

Launched firefox.exe[3128]
Low-level Drivers and Services
Registry Key hkey_local_machine\system\ControlSet001\services
Subkey MozillaMaintenance has been added