Override the upgrade page

If this policy is enabled, you can specify a URL to be displayed after Firefox is updated. If you leave the URL blank, no upgrade page will be shown. If this policy is disabled or not configured, the upgrade page is displayed.

• Computer
  Allow File Selection Dialogs

  Firefox 124 or later
• User
  Allow File Selection Dialogs

  Firefox 124 or later
• User
  Application Autoupdate

  Firefox 75 or later, Firefox 68.7 ESR or later
• Computer
  Application Autoupdate

  Firefox 75 or later, Firefox 68.7 ESR or later
• Computer
  Auto Launch Protocols From Origins

  Firefox 81 or later, Firefox 78.3 ESR or later
• User
  Auto Launch Protocols From Origins

  Firefox 81 or later, Firefox 78.3 ESR or later
• Computer
  Auto Launch Protocols From Origins (JSON on one line)

  Firefox 81 or later, Firefox 78.3 ESR or later