diff --git a/testing/marionette/client/marionette_driver/marionette.py b/testing/marionette/client/marionette_driver/marionette.py
index ee1dab660683..4f5db2fffd1c 100644
--- a/testing/marionette/client/marionette_driver/marionette.py
+++ b/testing/marionette/client/marionette_driver/marionette.py
@@ -1466,6 +1466,8 @@ class Marionette(object):
 
         :returns: a dictionary with x and y
         """
+        warnings.warn("get_window_position() has been deprecated, please use get_window_rect()",
+                      DeprecationWarning)
         return self._send_message(
             "getWindowPosition", key="value" if self.protocol == 1 else None)
 
@@ -1500,6 +1502,10 @@ class Marionette(object):
                                                     "height": height,
                                                     "width": width})
 
+    @property
+    def window_rect(self):
+        return self._send_message("getWindowRect")
+
     @property
     def title(self):
         """Current title of the active window."""
@@ -2184,6 +2190,8 @@ class Marionette(object):
 
         :returns: dictionary representation of current window width and height
         """
+        warnings.warn("window_size property has been deprecated, please use get_window_rect()",
+                      DeprecationWarning)
         return self._send_message("getWindowSize",
                                   key="value" if self.protocol == 1 else None)
 
diff --git a/testing/marionette/driver.js b/testing/marionette/driver.js
index 2a07e7e666bc..f79ef41b5679 100644
--- a/testing/marionette/driver.js
+++ b/testing/marionette/driver.js
@@ -1247,17 +1247,23 @@ GeckoDriver.prototype.getChromeWindowHandles = function (cmd, resp) {
 }
 
 /**
- * Get the current window position.
+ * Get the current position and size of the browser window currently in focus.
+ *
+ * Will return the current browser window size in pixels. Refers to
+ * window outerWidth and outerHeight values, which include scroll bars,
+ * title bars, etc.
  *
  * @return {Object.<string, number>}
- *     Object with |x| and |y| coordinates.
+ *     Object with |x| and |y| coordinates, and |width| and |height|
+ *     of browser window.
  */
-GeckoDriver.prototype.getWindowPosition = function (cmd, resp) {
+GeckoDriver.prototype.getWindowRect = function (cmd, resp) {
   let win = assert.window(this.getCurrentWindow());
-
   return {
     x: win.screenX,
     y: win.screenY,
+    width: win.outerWidth,
+    height: win.outerHeight,
   };
 };
 
@@ -2580,21 +2586,6 @@ GeckoDriver.prototype.setScreenOrientation = function (cmd, resp) {
   }
 };
 
-/**
- * Get the size of the browser window currently in focus.
- *
- * Will return the current browser window size in pixels. Refers to
- * window outerWidth and outerHeight values, which include scroll bars,
- * title bars, etc.
- */
-GeckoDriver.prototype.getWindowSize = function (cmd, resp) {
-  let win = assert.window(this.getCurrentWindow());
-  return {
-    width: win.outerWidth,
-    height: win.outerHeight,
-  };
-};
-
 /**
  * Maximizes the user agent window as if the user pressed the maximise
  * button.
@@ -3014,9 +3005,10 @@ GeckoDriver.prototype.commands = {
   "getCurrentChromeWindowHandle": GeckoDriver.prototype.getChromeWindowHandle,
   "getWindowHandles": GeckoDriver.prototype.getWindowHandles,
   "getChromeWindowHandles": GeckoDriver.prototype.getChromeWindowHandles,
-  "getWindowPosition": GeckoDriver.prototype.getWindowPosition,
+  "getWindowPosition": GeckoDriver.prototype.getWindowRect, // Redirecting for compatibility
   "setWindowPosition": GeckoDriver.prototype.setWindowRect, // Redirecting for compatibility
   "setWindowRect": GeckoDriver.prototype.setWindowRect,
+  "getWindowRect": GeckoDriver.prototype.getWindowRect,
   "getActiveFrame": GeckoDriver.prototype.getActiveFrame,
   "switchToFrame": GeckoDriver.prototype.switchToFrame,
   "switchToParentFrame": GeckoDriver.prototype.switchToParentFrame,
@@ -3037,7 +3029,7 @@ GeckoDriver.prototype.commands = {
   "getActiveElement": GeckoDriver.prototype.getActiveElement,
   "getScreenOrientation": GeckoDriver.prototype.getScreenOrientation,
   "setScreenOrientation": GeckoDriver.prototype.setScreenOrientation,
-  "getWindowSize": GeckoDriver.prototype.getWindowSize,
+  "getWindowSize": GeckoDriver.prototype.getWindowRect, // Redirecting for compatibility
   "setWindowSize": GeckoDriver.prototype.setWindowRect, // Redirecting for compatibility
   "maximizeWindow": GeckoDriver.prototype.maximizeWindow,
   "dismissDialog": GeckoDriver.prototype.dismissDialog,
diff --git a/testing/marionette/harness/marionette_harness/tests/unit/test_window_position.py b/testing/marionette/harness/marionette_harness/tests/unit/test_window_position.py
index c0d130c13253..0b902c809697 100644
--- a/testing/marionette/harness/marionette_harness/tests/unit/test_window_position.py
+++ b/testing/marionette/harness/marionette_harness/tests/unit/test_window_position.py
@@ -35,7 +35,7 @@ class TestWindowPosition(MarionetteTestCase):
                                             x=None, y=None)
 
     def test_set_position_with_rect(self):
-        old_position = self.marionette.get_window_position()
+        old_position = self.marionette.window_rect
         wanted_position = {"x": old_position["x"] + 10, "y": old_position["y"] + 10}
 
         new_position = self.marionette.set_window_rect(x=wanted_position["x"], y=wanted_position["y"])