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Are you sure? The OP links to https://support.mozilla.org/en-US/kb/what-mozilla-maintenance-service https://support.mozilla.org/en-US/kb/what-mozilla-maintenan

• dblohm7 5y ago
  The maintenance service is used to avoid UAC prompts during upgrades. That feature has been around for over a decade now. The background update stuff uses the Windows task scheduler to schedule update checks, not the maintenance service. (I used to work on the team that at the time owned this stuff)