--- a/devtools/server/actors/animation.js
+++ b/devtools/server/actors/animation.js
@@ -21,17 +21,16 @@
  * References:
  * - WebAnimation spec:
  *   http://drafts.csswg.org/web-animations/
  * - WebAnimation WebIDL files:
  *   /dom/webidl/Animation*.webidl
  */
 
 const {Cu, Ci} = require("chrome");
-const promise = require("promise");
 const protocol = require("devtools/shared/protocol");
 const {Actor} = protocol;
 const {animationPlayerSpec, animationsSpec} = require("devtools/shared/specs/animation");
 
 // Types of animations.
 const ANIMATION_TYPES = {
   CSS_ANIMATION: "cssanimation",
   CSS_TRANSITION: "csstransition",

--- a/devtools/server/actors/common.js
+++ b/devtools/server/actors/common.js
@@ -1,17 +1,16 @@
 /* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
 /* vim: set ft=javascript ts=2 et sw=2 tw=80: */
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 "use strict";
 
-const promise = require("promise");
 const { method } = require("devtools/shared/protocol");
 
 /**
  * Creates "registered" actors factory meant for creating another kind of
  * factories, ObservedActorFactory, during the call to listTabs.
  * These factories live in DebuggerServer.{tab|global}ActorFactories.
  *
  * These actors only exposes:

--- a/devtools/server/actors/inspector/utils.js
+++ b/devtools/server/actors/inspector/utils.js
@@ -1,17 +1,16 @@
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 "use strict";
 
 const {Ci, Cu} = require("chrome");
 
-const promise = require("promise");
 const {Task} = require("devtools/shared/task");
 
 loader.lazyRequireGetter(this, "AsyncUtils", "devtools/shared/async-utils");
 loader.lazyRequireGetter(this, "flags", "devtools/shared/flags");
 loader.lazyRequireGetter(this, "DevToolsUtils", "devtools/shared/DevToolsUtils");
 loader.lazyRequireGetter(this, "nodeFilterConstants", "devtools/shared/dom-node-filter-constants");
 
 loader.lazyRequireGetter(this, "isNativeAnonymous", "devtools/shared/layout/utils", true);

--- a/devtools/server/actors/source.js
+++ b/devtools/server/actors/source.js
@@ -10,17 +10,16 @@ const { Cc, Ci } = require("chrome");
 const Services = require("Services");
 const { BreakpointActor, setBreakpointAtEntryPoints } = require("devtools/server/actors/breakpoint");
 const { OriginalLocation, GeneratedLocation } = require("devtools/server/actors/common");
 const { createValueGrip, arrayBufferGrip } = require("devtools/server/actors/object");
 const { ActorClassWithSpec } = require("devtools/shared/protocol");
 const DevToolsUtils = require("devtools/shared/DevToolsUtils");
 const { assert, fetch } = DevToolsUtils;
 const { joinURI } = require("devtools/shared/path");
-const promise = require("promise");
 const { sourceSpec } = require("devtools/shared/specs/source");
 
 loader.lazyRequireGetter(this, "SourceMapConsumer", "source-map", true);
 loader.lazyRequireGetter(this, "SourceMapGenerator", "source-map", true);
 loader.lazyRequireGetter(this, "mapURIToAddonID", "devtools/server/actors/utils/map-uri-to-addon-id");
 
 function isEvalSource(source) {
   let introType = source.introductionType;

--- a/devtools/server/actors/storage.js
+++ b/devtools/server/actors/storage.js
@@ -4,17 +4,16 @@
 
 "use strict";
 
 const {Cc, Ci, Cu, CC} = require("chrome");
 const protocol = require("devtools/shared/protocol");
 const {LongStringActor} = require("devtools/server/actors/string");
 const {DebuggerServer} = require("devtools/server/main");
 const Services = require("Services");
-const promise = require("promise");
 const defer = require("devtools/shared/defer");
 const {isWindowIncluded} = require("devtools/shared/layout/utils");
 const specs = require("devtools/shared/specs/storage");
 const { Task } = require("devtools/shared/task");
 
 const DEFAULT_VALUE = "value";
 
 loader.lazyRequireGetter(this, "naturalSortCaseInsensitive",

--- a/devtools/server/actors/string.js
+++ b/devtools/server/actors/string.js
@@ -1,17 +1,16 @@
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 "use strict";
 
 var {DebuggerServer} = require("devtools/server/main");
 
-var promise = require("promise");
 
 var protocol = require("devtools/shared/protocol");
 const {longStringSpec} = require("devtools/shared/specs/string");
 
 exports.LongStringActor = protocol.ActorClassWithSpec(longStringSpec, {
   initialize: function (conn, str) {
     protocol.Actor.prototype.initialize.call(this, conn);
     this.str = str;

--- a/devtools/server/actors/styles.js
+++ b/devtools/server/actors/styles.js
@@ -1,16 +1,15 @@
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 "use strict";
 
 const {Ci} = require("chrome");
-const promise = require("promise");
 const protocol = require("devtools/shared/protocol");
 const {LongStringActor} = require("devtools/server/actors/string");
 const {Task} = require("devtools/shared/task");
 const InspectorUtils = require("InspectorUtils");
 
 // This will also add the "stylesheet" actor type for protocol.js to recognize
 
 const {pageStyleSpec, styleRuleSpec, ELEMENT_STYLE} = require("devtools/shared/specs/styles");

--- a/devtools/server/actors/stylesheets.js
+++ b/devtools/server/actors/stylesheets.js
@@ -1,17 +1,16 @@
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 "use strict";
 
 const {Ci} = require("chrome");
 const Services = require("Services");
-const promise = require("promise");
 const defer = require("devtools/shared/defer");
 const {Task} = require("devtools/shared/task");
 const protocol = require("devtools/shared/protocol");
 const {LongStringActor} = require("devtools/server/actors/string");
 const {fetch} = require("devtools/shared/DevToolsUtils");
 const {mediaRuleSpec, styleSheetSpec,
        styleSheetsSpec} = require("devtools/shared/specs/stylesheets");
 const {

--- a/devtools/server/actors/thread.js
+++ b/devtools/server/actors/thread.js
@@ -9,17 +9,16 @@
 const Services = require("Services");
 const { Cc, Ci, Cr } = require("chrome");
 const { ActorPool, GeneratedLocation } = require("devtools/server/actors/common");
 const { createValueGrip, longStringGrip } = require("devtools/server/actors/object");
 const { ActorClassWithSpec } = require("devtools/shared/protocol");
 const DevToolsUtils = require("devtools/shared/DevToolsUtils");
 const flags = require("devtools/shared/flags");
 const { assert, dumpn } = DevToolsUtils;
-const promise = require("promise");
 const { DevToolsWorker } = require("devtools/shared/worker/worker");
 const { threadSpec } = require("devtools/shared/specs/script");
 
 const { resolve, reject, all } = promise;
 
 loader.lazyGetter(this, "Debugger", () => {
   let Debugger = require("Debugger");
   hackDebugger(Debugger);

--- a/devtools/server/actors/webbrowser.js
+++ b/devtools/server/actors/webbrowser.js
@@ -3,17 +3,16 @@
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 "use strict";
 
 var { Ci } = require("chrome");
 var Services = require("Services");
-var promise = require("promise");
 const defer = require("devtools/shared/defer");
 var { DebuggerServer } = require("devtools/server/main");
 var DevToolsUtils = require("devtools/shared/DevToolsUtils");
 
 loader.lazyRequireGetter(this, "RootActor", "devtools/server/actors/root", true);
 loader.lazyRequireGetter(this, "BrowserAddonActor", "devtools/server/actors/addon", true);
 loader.lazyRequireGetter(this, "WebExtensionParentActor", "devtools/server/actors/webextension-parent", true);
 loader.lazyRequireGetter(this, "WorkerActorList", "devtools/server/actors/worker-list", true);

--- a/devtools/server/tests/mochitest/inspector-helpers.js
+++ b/devtools/server/tests/mochitest/inspector-helpers.js
@@ -6,17 +6,16 @@
 
 const {require} = ChromeUtils.import("resource://devtools/shared/Loader.jsm", {});
 const {DebuggerClient} = require("devtools/shared/client/debugger-client");
 const {DebuggerServer} = require("devtools/server/main");
 const { Task } = require("devtools/shared/task");
 
 const Services = require("Services");
 // promise is still used in tests using this helper
-const promise = require("promise"); // eslint-disable-line no-unused-vars
 const defer = require("devtools/shared/defer");
 const {DocumentWalker: _documentWalker} = require("devtools/server/actors/inspector/document-walker");
 
 // Always log packets when running tests.
 Services.prefs.setBoolPref("devtools.debugger.log", true);
 SimpleTest.registerCleanupFunction(function () {
   Services.prefs.clearUserPref("devtools.debugger.log");
 });

--- a/devtools/server/tests/mochitest/test_inspector-resize.html
+++ b/devtools/server/tests/mochitest/test_inspector-resize.html
@@ -10,17 +10,16 @@ https://bugzilla.mozilla.org/show_bug.cg
   <script type="application/javascript" src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
   <link rel="stylesheet" type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css">
   <script type="application/javascript" src="inspector-helpers.js"></script>
   <script type="application/javascript">
 "use strict";
 
 window.onload = function () {
   const {require} = ChromeUtils.import("resource://devtools/shared/Loader.jsm", {});
-  const promise = require("promise");
   const {InspectorFront} = require("devtools/shared/fronts/inspector");
 
   SimpleTest.waitForExplicitFinish();
 
   let win = null;
   let inspector = null;
 
   addAsyncTest(function* setup() {

--- a/devtools/server/tests/mochitest/test_inspector-search-front.html
+++ b/devtools/server/tests/mochitest/test_inspector-search-front.html
@@ -9,17 +9,16 @@ https://bugzilla.mozilla.org/show_bug.cg
   <script type="application/javascript" src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
   <link rel="stylesheet" type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css">
   <script type="application/javascript" src="inspector-helpers.js"></script>
   <script type="application/javascript">
 "use strict";
 
 window.onload = function () {
   const {require} = ChromeUtils.import("resource://devtools/shared/Loader.jsm", {});
-  const promise = require("promise");
   const {InspectorFront} = require("devtools/shared/fronts/inspector");
 
   SimpleTest.waitForExplicitFinish();
 
   let walkerFront = null;
   let inspector = null;
 
   // WalkerFront specific tests.  These aren't to excercise search

--- a/devtools/server/tests/mochitest/test_inspector-search.html
+++ b/devtools/server/tests/mochitest/test_inspector-search.html
@@ -9,17 +9,16 @@ https://bugzilla.mozilla.org/show_bug.cg
   <script type="application/javascript" src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
   <link rel="stylesheet" type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css">
   <script type="application/javascript" src="inspector-helpers.js"></script>
   <script type="application/javascript">
 "use strict";
 
 window.onload = function () {
   const {require} = ChromeUtils.import("resource://devtools/shared/Loader.jsm", {});
-  const promise = require("promise");
   const {InspectorFront} = require("devtools/shared/fronts/inspector");
   const {WalkerSearch, WalkerIndex} =
     require("devtools/server/actors/utils/walker-search");
 
   SimpleTest.waitForExplicitFinish();
 
   let walkerActor = null;
   let walkerSearch = null;

--- a/devtools/server/tests/unit/head_dbg.js
+++ b/devtools/server/tests/unit/head_dbg.js
@@ -15,17 +15,16 @@ ChromeUtils.import("resource://testing-c
   name: "devtools-tests",
   version: "1",
   platformVersion: "42",
   crashReporter: true,
 });
 
 const { require, loader } = ChromeUtils.import("resource://devtools/shared/Loader.jsm", {});
 const { worker } = ChromeUtils.import("resource://devtools/shared/worker/loader.js", {});
-const promise = require("promise");
 const defer = require("devtools/shared/defer");
 const { Task } = require("devtools/shared/task");
 const { console } = require("resource://gre/modules/Console.jsm");
 const { NetUtil } = require("resource://gre/modules/NetUtil.jsm");
 
 const Services = require("Services");
 // Always log packets when running tests. runxpcshelltests.py will throw
 // the output away anyway, unless you give it the --verbose flag.