--- a/devtools/client/responsive.html/devices.js
+++ b/devtools/client/responsive.html/devices.js
@@ -12,17 +12,17 @@ const { addDevice, addDeviceType } = req
 const DISPLAYED_DEVICES_PREF = "devtools.responsive.html.displayedDeviceList";
 
 /**
  * Get the device catalog and load the devices onto the store.
  *
  * @param  {Function} dispatch
  *         Action dispatch function
  */
-let initDevices = Task.async(function*(dispatch) {
+let initDevices = Task.async(function* (dispatch) {
   let deviceList = loadDeviceList();
   let devices = yield GetDevices();
 
   for (let type of devices.TYPES) {
     dispatch(addDeviceType(type));
     for (let device of devices[type]) {
       if (device.os == "fxos") {
         continue;

--- a/devtools/client/responsive.html/index.js
+++ b/devtools/client/responsive.html/index.js
@@ -29,17 +29,17 @@ const { changeLocation } = require("./ac
 const { addViewport, resizeViewport } = require("./actions/viewports");
 
 let bootstrap = {
 
   telemetry: new Telemetry(),
 
   store: null,
 
-  init: Task.async(function*() {
+  init: Task.async(function* () {
     // Load a special UA stylesheet to reset certain styles such as dropdown
     // lists.
     loadSheet(window,
               "resource://devtools/client/responsive.html/responsive-ua.css",
               "agent");
     this.telemetry.toolOpened("responsive");
     let store = this.store = Store();
     yield initDevices(this.dispatch.bind(this));

--- a/devtools/client/responsive.html/test/unit/test_update_device_displayed.js
+++ b/devtools/client/responsive.html/test/unit/test_update_device_displayed.js
@@ -6,17 +6,17 @@
 // Test updating the device `displayed` property
 
 const {
   addDevice,
   addDeviceType,
   updateDeviceDisplayed,
 } = require("devtools/client/responsive.html/actions/devices");
 
-add_task(function*() {
+add_task(function* () {
   let store = Store();
   const { getState, dispatch } = store;
 
   let device = {
     "name": "Firefox OS Flame",
     "width": 320,
     "height": 570,
     "pixelRatio": 1.5,