Actually way the background updater is done is much better than most. eg Instead of running its own downloader process, it uses the Windows BITS service to down

Actually way the background updater is done is much better than most. eg Instead of running its own downloader process, it uses the Windows BITS service to download updates. People often confuse this feature with the Mozilla Maintenance Service, the latter has shipped with Firefox for more than a decade and is used to avoid UAC prompts during updates. (I used to work at Mozilla and at one point also worked on the team that owns install/update.)