Control the installation of external extensions.
If you enable this setting, external extensions are blocked from being installed.
If you disable this setting or leave it unset, external extensions are allowed to be installed.
External extensions and their installation are documented at https://docs.microsoft.com/microsoft-edge/extensions-chromium/developer-guide/alternate-distribution-options.
| Registry Hive | HKEY_LOCAL_MACHINE or HKEY_CURRENT_USER |
| Registry Path | Software\Policies\Microsoft\Edge |
| Value Name | BlockExternalExtensions |
| Value Type | REG_DWORD |
| Enabled Value | 1 |
| Disabled Value | 0 |