diff --git a/tools/wptrunner/wptrunner/executors/executormarionette.py b/tools/wptrunner/wptrunner/executors/executormarionette.py
index 95f186082042e3..a3b56fe08df11e 100644
--- a/tools/wptrunner/wptrunner/executors/executormarionette.py
+++ b/tools/wptrunner/wptrunner/executors/executormarionette.py
@@ -48,10 +48,11 @@
 
 
 def do_delayed_imports():
-    global errors, marionette, Addons
+    global errors, marionette, Addons, WebAuthn
 
     from marionette_driver import marionette, errors
     from marionette_driver.addons import Addons
+    from marionette_driver.webauthn import WebAuthn
 
 
 def _switch_to_window(marionette, handle):
@@ -590,28 +591,28 @@ def generate_test_report(self, config):
 
 class MarionetteVirtualAuthenticatorProtocolPart(VirtualAuthenticatorProtocolPart):
     def setup(self):
-        self.marionette = self.parent.marionette
+        self.webauthn = WebAuthn(self.parent.marionette)
 
     def add_virtual_authenticator(self, config):
-        raise NotImplementedError("add_virtual_authenticator not yet implemented")
+        return self.webauthn.add_virtual_authenticator(config)
 
     def remove_virtual_authenticator(self, authenticator_id):
-        raise NotImplementedError("remove_virtual_authenticator not yet implemented")
+        self.webauthn.remove_virtual_authenticator(authenticator_id)
 
     def add_credential(self, authenticator_id, credential):
-        raise NotImplementedError("add_credential not yet implemented")
+        self.webauthn.add_credential(authenticator_id, credential)
 
     def get_credentials(self, authenticator_id):
-        raise NotImplementedError("get_credentials not yet implemented")
+        return self.webauthn.get_credentials(authenticator_id)
 
     def remove_credential(self, authenticator_id, credential_id):
-        raise NotImplementedError("remove_credential not yet implemented")
+        self.webauthn.remove_credential(authenticator_id, credential_id)
 
     def remove_all_credentials(self, authenticator_id):
-        raise NotImplementedError("remove_all_credentials not yet implemented")
+        self.webauthn.remove_all_credentials(authenticator_id)
 
     def set_user_verified(self, authenticator_id, uv):
-        raise NotImplementedError("set_user_verified not yet implemented")
+        self.webauthn.set_user_verified(authenticator_id, uv)
 
 
 class MarionetteSetPermissionProtocolPart(SetPermissionProtocolPart):