--- a/testing/marionette/harness/marionette_harness/tests/unit/test_capabilities.py
+++ b/testing/marionette/harness/marionette_harness/tests/unit/test_capabilities.py
@@ -52,29 +52,16 @@ class TestCapabilities(MarionetteTestCas
                 current_profile = self.marionette.instance.runner.device.app_ctx.remote_profile
             else:
                 current_profile = self.marionette.instance.runner.profile.profile
             self.assertEqual(self.caps["moz:profile"], current_profile)
             self.assertEqual(self.marionette.profile, current_profile)
 
         self.assertIn("moz:accessibilityChecks", self.caps)
         self.assertFalse(self.caps["moz:accessibilityChecks"])
-        self.assertIn("specificationLevel", self.caps)
-        self.assertEqual(self.caps["specificationLevel"], 0)
-
-    def test_set_specification_level(self):
-        self.marionette.delete_session()
-        self.marionette.start_session({"desiredCapabilities": {"specificationLevel": 2}})
-        caps = self.marionette.session_capabilities
-        self.assertEqual(2, caps["specificationLevel"])
-
-        self.marionette.delete_session()
-        self.marionette.start_session({"requiredCapabilities": {"specificationLevel": 3}})
-        caps = self.marionette.session_capabilities
-        self.assertEqual(3, caps["specificationLevel"])
 
     def test_we_can_pass_in_required_capabilities_on_session_start(self):
         self.marionette.delete_session()
         capabilities = {"requiredCapabilities": {"browserName": self.appinfo["name"].lower()}}
         self.marionette.start_session(capabilities)
         caps = self.marionette.session_capabilities
         self.assertIn("browserName", caps)