Users

Kitsune uses Mozilla accounts for authentication: https://support.mozilla.org/kb/firefox-accounts-mozilla-support-faq

Account managers

User.objects excludes users whose profiles are marked as system accounts. User.all_users retains Django's original unfiltered manager for operations that must include those accounts.

UserConfig.ready() installs the filtered manager and group-access monitoring once per User model. Django can call it again when rebuilding the app registry, including during tests that override INSTALLED_APPS. Reinitialization must preserve the original unfiltered manager and avoid wrapping monitoring again.