Do not allow preferences to be changed

If this policy is enabled, pop-up preferences cannot be changed by the user.

If this policy is disabled or not configured, the user can change their pop-up preferences.

Supported on: Firefox 60 or later, Firefox 60 ESR or later
Registry HiveHKEY_LOCAL_MACHINE or HKEY_CURRENT_USER
Registry PathSoftware\Policies\Mozilla\Firefox\PopupBlocking
Value NameLocked
Value TypeREG_DWORD
Enabled Value1
Disabled Value0

firefox.admx

Administrative Templates (Computers)

Administrative Templates (Users)