The UserMessaging policy is now unsupported in Firefox Enterprise and rejected by the policy engine. It was previously configured as:

UserMessaging : {
  ExtensionRecommendations: false
  FeatureRecommendations: false
  FirefoxLabs: false
  MoreFromMozilla: false
  SkipOnboarding: true
  UrlbarInterventions: false
  Locked: true
}

Extension and feature recommendations and Firefox Labs are handled in Bug 2073149. The remaining options now have no effect, so a fresh
enterprise profile shows:

• "More from Mozilla" in the Settings sidebar.
• The about:welcome onboarding flow
• Urlbar intervention tips when quick action suggestions are turned off,
  e.g. typing "firefox slow" offers "Refresh Firefox Enterprise…", which
  resets the managed profile.

Expected: None of these appear in enterprise builds, and users cannot re-enable them.

(via GitHub webhook, authenticated as shared-secret)

The about:welcome onboarding flow

Ok, but we updated the assets there to use correct enterprise branding, do we really want to disable about:welcome ?

Authored by https://github.com/1rneh
https://github.com/mozilla/enterprise-firefox/commit/2b7b488f75f00723c16be5cf7f4c8da3bad0a8b3
[enterprise-main] Bug 2082020 - Disable More from Mozilla, onboarding and urlbar interventions (#1680)

(via GitHub webhook, authenticated as shared-secret)

Hello,
We verified this on Windows 11x64, with Firefox Enterprise 160.0a1 (20261017091908).

• "More from Mozilla" is no longer displayed in the Settings sidebar.
• The about:welcome page cannotbe accessed (it defaults back to the new tab page)
• Urlbar intervention tips when quick action suggestions are turned off,
  e.g. typing "restart" does not suggest the "Restart Firefox Eneterprise" action when Quick action option is unchecked in Settings.

Please let us know if there is anything else we need to check for this issue.
Thank you.

Great, thank you for verifying!

Confirmed verified on on Windows 11x64, with Firefox Enterprise 160.0 (20261105165157). as well.