stable21 Jul 2026 to 13 Oct 2026

Mozilla Firefox: 8.0 to 8.4

17 new settings, 3 changed since 8.0. 4 retained releases apart.

CSV JSONBrowse its 424 settings Vendor download page

Wording or translations only

65 settings · compared with 8.0

security.osclientcerts.autoload
Computer and user · Mozilla\Firefox\Preferences (Deprecated)
- Description … preference is locked to false. For a description of the preference, see: ~~[removed: https://github.com/mozilla/policy-templates/blob/master/README.md#preferences]~~[added: https://firefox-admin-docs.mozilla.org/reference/policies/preferences/]
  Whole description, marked
  If this policy is enabled, the preference is locked to true. If this policy is disabled, the preference is locked to false. For a description of the preference, see: ~~[removed: https://github.com/mozilla/policy-templates/blob/master/README.md#preferences]~~[added: https://firefox-admin-docs.mozilla.org/reference/policies/preferences/]
security.ssl.errorReporting.enabled
Computer and user · Mozilla\Firefox\Preferences (Deprecated)
- Description … preference is locked to false. For a description of the preference, see: ~~[removed: https://github.com/mozilla/policy-templates/blob/master/README.md#preferences]~~[added: https://firefox-admin-docs.mozilla.org/reference/policies/preferences/]
  Whole description, marked
  If this policy is enabled, the preference is locked to true. If this policy is disabled, the preference is locked to false. For a description of the preference, see: ~~[removed: https://github.com/mozilla/policy-templates/blob/master/README.md#preferences]~~[added: https://firefox-admin-docs.mozilla.org/reference/policies/preferences/]
security.tls.hello_downgrade_check
Computer and user · Mozilla\Firefox\Preferences (Deprecated)
- Description … preference is locked to false. For a description of the preference, see: ~~[removed: https://github.com/mozilla/policy-templates/blob/master/README.md#preferences]~~[added: https://firefox-admin-docs.mozilla.org/reference/policies/preferences/]
  Whole description, marked
  If this policy is enabled, the preference is locked to true. If this policy is disabled, the preference is locked to false. For a description of the preference, see: ~~[removed: https://github.com/mozilla/policy-templates/blob/master/README.md#preferences]~~[added: https://firefox-admin-docs.mozilla.org/reference/policies/preferences/]
ui.key.menuAccessKeyFocuses
Computer and user · Mozilla\Firefox\Preferences (Deprecated)
- Description … preference is locked to false. For a description of the preference, see: ~~[removed: https://github.com/mozilla/policy-templates/blob/master/README.md#preferences]~~[added: https://firefox-admin-docs.mozilla.org/reference/policies/preferences/]
  Whole description, marked
  If this policy is enabled, the preference is locked to true. If this policy is disabled, the preference is locked to false. For a description of the preference, see: ~~[removed: https://github.com/mozilla/policy-templates/blob/master/README.md#preferences]~~[added: https://firefox-admin-docs.mozilla.org/reference/policies/preferences/]
widget.content.gtk-theme-override
Computer and user · Mozilla\Firefox\Preferences (Deprecated)
- Description … disabled, it has no effect. For a description of the preference, see: ~~[removed: https://github.com/mozilla/policy-templates/blob/master/README.md#preferences]~~[added: https://firefox-admin-docs.mozilla.org/reference/policies/preferences/]
  Whole description, marked
  If this policy is enabled, the preference is locked to the string entered. If this policy is disabled, it has no effect. For a description of the preference, see: ~~[removed: https://github.com/mozilla/policy-templates/blob/master/README.md#preferences]~~[added: https://firefox-admin-docs.mozilla.org/reference/policies/preferences/]