diff --git a/testing/marionette/driver.js b/testing/marionette/driver.js
index 352617fdfaaa..88a1055aabd2 100644
--- a/testing/marionette/driver.js
+++ b/testing/marionette/driver.js
@@ -3645,60 +3645,6 @@ GeckoDriver.prototype.commands = {
   "WebDriver:SwitchToShadowRoot": GeckoDriver.prototype.switchToShadowRoot,
   "WebDriver:SwitchToWindow": GeckoDriver.prototype.switchToWindow,
   "WebDriver:TakeScreenshot": GeckoDriver.prototype.takeScreenshot,
-
-  // deprecated WebDriver commands, remove in Firefox 63
-  "acceptDialog": GeckoDriver.prototype.acceptDialog,
-  "addCookie": GeckoDriver.prototype.addCookie,
-  "clearElement": GeckoDriver.prototype.clearElement,
-  "clickElement": GeckoDriver.prototype.clickElement,
-  "close": GeckoDriver.prototype.close,
-  "deleteAllCookies": GeckoDriver.prototype.deleteAllCookies,
-  "deleteCookie": GeckoDriver.prototype.deleteCookie,
-  "deleteSession": GeckoDriver.prototype.deleteSession,
-  "dismissDialog": GeckoDriver.prototype.dismissDialog,
-  "executeAsyncScript": GeckoDriver.prototype.executeAsyncScript,
-  "executeScript": GeckoDriver.prototype.executeScript,
-  "findElement": GeckoDriver.prototype.findElement,
-  "findElements": GeckoDriver.prototype.findElements,
-  "fullscreen": GeckoDriver.prototype.fullscreenWindow,
-  "getActiveElement": GeckoDriver.prototype.getActiveElement,
-  "getActiveFrame": GeckoDriver.prototype.getActiveFrame,
-  "getCookies": GeckoDriver.prototype.getCookies,
-  "getCurrentUrl": GeckoDriver.prototype.getCurrentUrl,
-  "getElementAttribute": GeckoDriver.prototype.getElementAttribute,
-  "getElementProperty": GeckoDriver.prototype.getElementProperty,
-  "getElementRect": GeckoDriver.prototype.getElementRect,
-  "getElementTagName": GeckoDriver.prototype.getElementTagName,
-  "getElementText": GeckoDriver.prototype.getElementText,
-  "getElementValueOfCssProperty": GeckoDriver.prototype.getElementValueOfCssProperty,
-  "get": GeckoDriver.prototype.get,
-  "getPageSource": GeckoDriver.prototype.getPageSource,
-  "getSessionCapabilities": GeckoDriver.prototype.getSessionCapabilities,
-  "getTextFromDialog": GeckoDriver.prototype.getTextFromDialog,
-  "getTimeouts": GeckoDriver.prototype.getTimeouts,
-  "getTitle": GeckoDriver.prototype.getTitle,
-  "getWindowHandle": GeckoDriver.prototype.getWindowHandle,
-  "getWindowHandles": GeckoDriver.prototype.getWindowHandles,
-  "getWindowRect": GeckoDriver.prototype.getWindowRect,
-  "goBack": GeckoDriver.prototype.goBack,
-  "goForward": GeckoDriver.prototype.goForward,
-  "isElementDisplayed": GeckoDriver.prototype.isElementDisplayed,
-  "isElementEnabled": GeckoDriver.prototype.isElementEnabled,
-  "isElementSelected": GeckoDriver.prototype.isElementSelected,
-  "maximizeWindow": GeckoDriver.prototype.maximizeWindow,
-  "newSession": GeckoDriver.prototype.newSession,
-  "performActions": GeckoDriver.prototype.performActions,
-  "refresh":  GeckoDriver.prototype.refresh,
-  "releaseActions": GeckoDriver.prototype.releaseActions,
-  "sendKeysToDialog": GeckoDriver.prototype.sendKeysToDialog,
-  "sendKeysToElement": GeckoDriver.prototype.sendKeysToElement,
-  "setTimeouts": GeckoDriver.prototype.setTimeouts,
-  "setWindowRect": GeckoDriver.prototype.setWindowRect,
-  "switchToFrame": GeckoDriver.prototype.switchToFrame,
-  "switchToParentFrame": GeckoDriver.prototype.switchToParentFrame,
-  "switchToShadowRoot": GeckoDriver.prototype.switchToShadowRoot,
-  "switchToWindow": GeckoDriver.prototype.switchToWindow,
-  "takeScreenshot": GeckoDriver.prototype.takeScreenshot,
 };
 
 function getOuterWindowId(win) {
diff --git a/testing/marionette/harness/marionette_harness/tests/unit/test_capabilities.py b/testing/marionette/harness/marionette_harness/tests/unit/test_capabilities.py
index d003c2f52bcf..90446f47fc87 100644
--- a/testing/marionette/harness/marionette_harness/tests/unit/test_capabilities.py
+++ b/testing/marionette/harness/marionette_harness/tests/unit/test_capabilities.py
@@ -154,7 +154,7 @@ class TestCapabilityMatching(MarionetteTestCase):
         self.marionette.start_session(caps)
         self.assertIn("timeouts", self.marionette.session_capabilities)
         self.assertDictEqual(self.marionette.session_capabilities["timeouts"], timeouts)
-        self.assertDictEqual(self.marionette._send_message("getTimeouts"), timeouts)
+        self.assertDictEqual(self.marionette._send_message("WebDriver:GetTimeouts"), timeouts)
 
     def test_unhandled_prompt_behavior(self):
         behaviors = [
diff --git a/testing/marionette/harness/marionette_harness/tests/unit/test_execute_script.py b/testing/marionette/harness/marionette_harness/tests/unit/test_execute_script.py
index b0e3f2e084d4..9cb53f0245f0 100644
--- a/testing/marionette/harness/marionette_harness/tests/unit/test_execute_script.py
+++ b/testing/marionette/harness/marionette_harness/tests/unit/test_execute_script.py
@@ -256,7 +256,7 @@ class TestExecuteContent(MarionetteTestCase):
     def test_lasting_side_effects(self):
         def send(script):
             return self.marionette._send_message(
-                "executeScript", {"script": script}, key="value")
+                "WebDriver:ExecuteScript", {"script": script}, key="value")
 
         send("window.foo = 1")
         foo = send("return window.foo")
@@ -351,7 +351,7 @@ class TestExecuteContent(MarionetteTestCase):
 
     @skip_if_mobile("Modal dialogs not supported in Fennec")
     def test_return_value_on_alert(self):
-        res = self.marionette._send_message("executeScript", {"script": "alert()"})
+        res = self.marionette._send_message("WebDriver:ExecuteScript", {"script": "alert()"})
         self.assertIn("value", res)
         self.assertIsNone(res["value"])
 
diff --git a/testing/marionette/harness/marionette_harness/tests/unit/test_mouse_action.py b/testing/marionette/harness/marionette_harness/tests/unit/test_mouse_action.py
index d1267de63619..45faaf9d1477 100644
--- a/testing/marionette/harness/marionette_harness/tests/unit/test_mouse_action.py
+++ b/testing/marionette/harness/marionette_harness/tests/unit/test_mouse_action.py
@@ -35,7 +35,7 @@ class Actions(object):
             "type": "pointer"
         }]}
 
-        return self.marionette._send_message("performActions", params=params)
+        return self.marionette._send_message("WebDriver:PerformActions", params=params)
 
     def move(self, element, x=0, y=0, duration=250):
         self.action_chain.append({
diff --git a/testing/marionette/harness/marionette_harness/tests/unit/test_session.py b/testing/marionette/harness/marionette_harness/tests/unit/test_session.py
index 3972b70a2981..78c1fdd4b2bd 100644
--- a/testing/marionette/harness/marionette_harness/tests/unit/test_session.py
+++ b/testing/marionette/harness/marionette_harness/tests/unit/test_session.py
@@ -44,7 +44,7 @@ class TestSession(MarionetteTestCase):
         self.marionette.start_session()
         self.assertTrue(isinstance(self.marionette.session_id, unicode))
         with self.assertRaises(errors.SessionNotCreatedException):
-            self.marionette._send_message("newSession", {})
+            self.marionette._send_message("WebDriver:NewSession", {})
 
     def test_no_session(self):
         with self.assertRaisesRegexp(errors.MarionetteException, "Please start a session"):