diff --git a/.eslintrc.js b/.eslintrc.js
index 91ea98684cec7..5eed135c74ed2 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -45,7 +45,6 @@ module.exports = {
     "files": [
       "extensions/pref/**",
       "mobile/android/**",
-      "testing/**",
     ],
     "rules": {
       "mozilla/use-services": "off",
diff --git a/testing/modules/AppData.jsm b/testing/modules/AppData.jsm
index f086a3e78b217..f6d5078d04ec5 100644
--- a/testing/modules/AppData.jsm
+++ b/testing/modules/AppData.jsm
@@ -10,6 +10,7 @@ this.EXPORTED_SYMBOLS = [
 
 ChromeUtils.import("resource://gre/modules/osfile.jsm");
 ChromeUtils.import("resource://gre/modules/Promise.jsm");
+ChromeUtils.import("resource://gre/modules/Services.jsm");
 
 // Reference needed in order for fake app dir provider to be active.
 var gFakeAppDirectoryProvider;
@@ -29,9 +30,7 @@ var gFakeAppDirectoryProvider;
  */
 this.makeFakeAppDir = function() {
   let dirMode = OS.Constants.libc.S_IRWXU;
-  let dirService = Cc["@mozilla.org/file/directory_service;1"]
-                     .getService(Ci.nsIProperties);
-  let baseFile = dirService.get("ProfD", Ci.nsIFile);
+  let baseFile = Services.dirsvc.get("ProfD", Ci.nsIFile);
   let appD = baseFile.clone();
   appD.append("UAppData");
 
@@ -83,12 +82,11 @@ this.makeFakeAppDir = function() {
   };
 
   // Register the new provider.
-  dirService.QueryInterface(Ci.nsIDirectoryService)
-            .registerProvider(provider);
+  Services.dirsvc.registerProvider(provider);
 
   // And undefine the old one.
   try {
-    dirService.undefine("UAppData");
+    Services.dirsvc.undefine("UAppData");
   } catch (ex) {}
 
   gFakeAppDirectoryProvider = provider;
@@ -96,4 +94,3 @@ this.makeFakeAppDir = function() {
   dump("Successfully installed fake UAppDir\n");
   return Promise.resolve(appD.path);
 };
-
diff --git a/testing/modules/AppInfo.jsm b/testing/modules/AppInfo.jsm
index 44471ad180cd6..6bcf4a33090f3 100644
--- a/testing/modules/AppInfo.jsm
+++ b/testing/modules/AppInfo.jsm
@@ -16,6 +16,7 @@ ChromeUtils.import("resource://gre/modules/XPCOMUtils.jsm");
 let origPlatformInfo = Cc["@mozilla.org/xre/app-info;1"]
     .getService(Ci.nsIPlatformInfo);
 
+// eslint-disable-next-line mozilla/use-services
 let origRuntime = Cc["@mozilla.org/xre/app-info;1"]
     .getService(Ci.nsIXULRuntime);
 
@@ -139,4 +140,3 @@ this.updateAppInfo = function(options) {
   // code may already have looked up |Cc[cid]|.
   Cc.initialize(Cc[cid], cid);
 };
-
diff --git a/testing/specialpowers/content/SpecialPowersObserver.jsm b/testing/specialpowers/content/SpecialPowersObserver.jsm
index f012da2730ae7..6357a79613540 100644
--- a/testing/specialpowers/content/SpecialPowersObserver.jsm
+++ b/testing/specialpowers/content/SpecialPowersObserver.jsm
@@ -23,9 +23,7 @@ const CHILD_LOGGER_SCRIPT = "chrome://specialpowers/content/MozillaLogger.js";
 
 
 // Glue to add in the observer API to this object.  This allows us to share code with chrome tests
-var loader = Components.classes["@mozilla.org/moz/jssubscript-loader;1"]
-                       .getService(Components.interfaces.mozIJSSubScriptLoader);
-loader.loadSubScript("chrome://specialpowers/content/SpecialPowersObserverAPI.js");
+Services.scriptloader.loadSubScript("chrome://specialpowers/content/SpecialPowersObserverAPI.js");
 
 /* XPCOM gunk */
 this.SpecialPowersObserver = function SpecialPowersObserver() {
@@ -108,13 +106,9 @@ SpecialPowersObserver.prototype.init = function() {
   obs.addObserver(this, "chrome-document-global-created");
 
   // Register special testing modules.
-  var testsURI = Cc["@mozilla.org/file/directory_service;1"].
-                   getService(Ci.nsIProperties).
-                   get("ProfD", Ci.nsIFile);
+  var testsURI = Services.dirsvc.get("ProfD", Ci.nsIFile);
   testsURI.append("tests.manifest");
-  var ioSvc = Cc["@mozilla.org/network/io-service;1"].
-                getService(Ci.nsIIOService);
-  var manifestFile = ioSvc.newFileURI(testsURI).
+  var manifestFile = Services.io.newFileURI(testsURI).
                        QueryInterface(Ci.nsIFileURL).file;
 
   Components.manager.QueryInterface(Ci.nsIComponentRegistrar).
@@ -170,11 +164,8 @@ SpecialPowersObserver.prototype._addProcessCrashObservers = function() {
     return;
   }
 
-  var obs = Components.classes["@mozilla.org/observer-service;1"]
-                      .getService(Components.interfaces.nsIObserverService);
-
-  obs.addObserver(this, "plugin-crashed");
-  obs.addObserver(this, "ipc:content-shutdown");
+  Services.obs.addObserver(this, "plugin-crashed");
+  Services.obs.addObserver(this, "ipc:content-shutdown");
   this._processCrashObserversRegistered = true;
 };
 
@@ -183,11 +174,8 @@ SpecialPowersObserver.prototype._removeProcessCrashObservers = function() {
     return;
   }
 
-  var obs = Components.classes["@mozilla.org/observer-service;1"]
-                      .getService(Components.interfaces.nsIObserverService);
-
-  obs.removeObserver(this, "plugin-crashed");
-  obs.removeObserver(this, "ipc:content-shutdown");
+  Services.obs.removeObserver(this, "plugin-crashed");
+  Services.obs.removeObserver(this, "ipc:content-shutdown");
   this._processCrashObserversRegistered = false;
 };
 
@@ -237,8 +225,7 @@ SpecialPowersObserver.prototype.receiveMessage = function(aMessage) {
       }
       break;
     case "SpecialPowers.Quit":
-      let appStartup = Cc["@mozilla.org/toolkit/app-startup;1"].getService(Ci.nsIAppStartup);
-      appStartup.quit(Ci.nsIAppStartup.eForceQuit);
+      Services.startup.quit(Ci.nsIAppStartup.eForceQuit);
       break;
     case "SpecialPowers.Focus":
       aMessage.target.focus();
diff --git a/testing/specialpowers/content/specialpowersAPI.js b/testing/specialpowers/content/specialpowersAPI.js
index d658db2e6cfd2..582c5803d60c0 100644
--- a/testing/specialpowers/content/specialpowersAPI.js
+++ b/testing/specialpowers/content/specialpowersAPI.js
@@ -46,8 +46,6 @@ function SpecialPowersAPI() {
   this._pendingPermissions = [];
   this._applyingPermissions = false;
   this._observingPermissions = false;
-  this._fm = null;
-  this._cb = null;
 }
 
 function bindDOMWindowUtils(aWindow) {
@@ -1620,9 +1618,7 @@ SpecialPowersAPI.prototype = {
 
   isMainProcess() {
     try {
-      return Cc["@mozilla.org/xre/app-info;1"].
-               getService(Ci.nsIXULRuntime).
-               processType == Ci.nsIXULRuntime.PROCESS_TYPE_DEFAULT;
+      return Services.appinfo.processType == Ci.nsIXULRuntime.PROCESS_TYPE_DEFAULT;
     } catch (e) { }
     return true;
   },
@@ -1633,9 +1629,7 @@ SpecialPowersAPI.prototype = {
     if (this._xpcomabi != null)
       return this._xpcomabi;
 
-    var xulRuntime = Cc["@mozilla.org/xre/app-info;1"]
-                        .getService(Components.interfaces.nsIXULAppInfo)
-                        .QueryInterface(Components.interfaces.nsIXULRuntime);
+    var xulRuntime = Services.appinfo.QueryInterface(Components.interfaces.nsIXULRuntime);
 
     this._xpcomabi = xulRuntime.XPCOMABI;
     return this._xpcomabi;
@@ -1659,23 +1653,15 @@ SpecialPowersAPI.prototype = {
     if (this._os != null)
       return this._os;
 
-    var xulRuntime = Cc["@mozilla.org/xre/app-info;1"]
-                        .getService(Components.interfaces.nsIXULAppInfo)
-                        .QueryInterface(Components.interfaces.nsIXULRuntime);
-
-    this._os = xulRuntime.OS;
+    this._os = Services.appinfo.OS;
     return this._os;
   },
 
   addSystemEventListener(target, type, listener, useCapture) {
-    Cc["@mozilla.org/eventlistenerservice;1"].
-      getService(Ci.nsIEventListenerService).
-      addSystemEventListener(target, type, listener, useCapture);
+    Services.els.addSystemEventListener(target, type, listener, useCapture);
   },
   removeSystemEventListener(target, type, listener, useCapture) {
-    Cc["@mozilla.org/eventlistenerservice;1"].
-      getService(Ci.nsIEventListenerService).
-      removeSystemEventListener(target, type, listener, useCapture);
+    Services.els.removeSystemEventListener(target, type, listener, useCapture);
   },
 
   // helper method to check if the event is consumed by either default group's
@@ -1746,28 +1732,22 @@ SpecialPowersAPI.prototype = {
     return obj;
   },
 
-  get focusManager() {
-    if (this._fm != null)
-      return this._fm;
-
-    this._fm = Components.classes["@mozilla.org/focus-manager;1"].
-                        getService(Components.interfaces.nsIFocusManager);
-
-    return this._fm;
-  },
-
   getFocusedElementForWindow(targetWindow, aDeep) {
     var outParam = {};
-    this.focusManager.getFocusedElementForWindow(targetWindow, aDeep, outParam);
+    Services.focus.getFocusedElementForWindow(targetWindow, aDeep, outParam);
     return outParam.value;
   },
 
+  get focusManager() {
+    return Services.focus;
+  },
+
   activeWindow() {
-    return this.focusManager.activeWindow;
+    return Services.focus.activeWindow;
   },
 
   focusedWindow() {
-    return this.focusManager.focusedWindow;
+    return Services.focus.focusedWindow;
   },
 
   focus(aWindow) {
@@ -1791,11 +1771,8 @@ SpecialPowersAPI.prototype = {
   },
 
   getClipboardData(flavor, whichClipboard) {
-    if (this._cb == null)
-      this._cb = Components.classes["@mozilla.org/widget/clipboard;1"].
-                            getService(Components.interfaces.nsIClipboard);
     if (whichClipboard === undefined)
-      whichClipboard = this._cb.kGlobalClipboard;
+      whichClipboard = Services.clipboard.kGlobalClipboard;
 
     var xferable = Components.classes["@mozilla.org/widget/transferable;1"].
                    createInstance(Components.interfaces.nsITransferable);
@@ -1805,7 +1782,7 @@ SpecialPowersAPI.prototype = {
     xferable.init(this._getDocShell(typeof(window) == "undefined" ? content.window : window)
                       .QueryInterface(Components.interfaces.nsILoadContext));
     xferable.addDataFlavor(flavor);
-    this._cb.getData(xferable, whichClipboard);
+    Services.clipboard.getData(xferable, whichClipboard);
     var data = {};
     try {
       xferable.getTransferData(flavor, data, {});
@@ -1824,11 +1801,7 @@ SpecialPowersAPI.prototype = {
   },
 
   supportsSelectionClipboard() {
-    if (this._cb == null) {
-      this._cb = Components.classes["@mozilla.org/widget/clipboard;1"].
-                            getService(Components.interfaces.nsIClipboard);
-    }
-    return this._cb.supportsSelectionClipboard();
+    return Services.clipboard.supportsSelectionClipboard();
   },
 
   swapFactoryRegistration(cid, contractID, newFactory, oldFactory) {
diff --git a/testing/talos/talos/pageloader/chrome/MozillaFileLogger.js b/testing/talos/talos/pageloader/chrome/MozillaFileLogger.js
index 594d5e9f7687f..6ada2d0a4a856 100644
--- a/testing/talos/talos/pageloader/chrome/MozillaFileLogger.js
+++ b/testing/talos/talos/pageloader/chrome/MozillaFileLogger.js
@@ -2,6 +2,8 @@
  * MozillaFileLogger, a log listener that can write to a local file.
  */
 
+ChromeUtils.import("resource://gre/modules/Services.jsm");
+
 // double logging to account for normal mode and ipc mode (mobile_profile only)
 // Ideally we would remove the dump() and just do ipc logging
 function dumpLog(msg) {
@@ -78,8 +80,6 @@ MozillaFileLogger.close = function() {
 };
 
 try {
-  var prefs = Cc["@mozilla.org/preferences-service;1"]
-    .getService(Ci.nsIPrefBranch);
-  var filename = prefs.getCharPref("talos.logfile");
+  var filename = Services.prefs.getCharPref("talos.logfile");
   MozillaFileLogger.init(filename);
 } catch (ex) {} // pref does not exist, return empty string
diff --git a/testing/talos/talos/pageloader/chrome/Profiler.js b/testing/talos/talos/pageloader/chrome/Profiler.js
index ce5aa6ee8f782..06b74f43d8a73 100644
--- a/testing/talos/talos/pageloader/chrome/Profiler.js
+++ b/testing/talos/talos/pageloader/chrome/Profiler.js
@@ -45,6 +45,7 @@ var Profiler;
 
   /* eslint-disable mozilla/use-chromeutils-import */
   try {
+    // eslint-disable-next-line mozilla/use-services
     _profiler = Components.classes["@mozilla.org/tools/profiler;1"].getService(Components.interfaces.nsIProfiler);
   } catch (ex) { (typeof(dumpLog) == "undefined" ? dump : dumpLog)(ex + "\n"); }
 
diff --git a/testing/talos/talos/pageloader/chrome/pageloader.js b/testing/talos/talos/pageloader/chrome/pageloader.js
index 39dc732106b24..8fb8a96166978 100644
--- a/testing/talos/talos/pageloader/chrome/pageloader.js
+++ b/testing/talos/talos/pageloader/chrome/pageloader.js
@@ -59,9 +59,6 @@ var browserWindow = null;
 var recordedName = null;
 var pageUrls;
 
-// the io service
-var gIOS = null;
-
 /**
  * SingleTimeout class. Allow to register one and only one callback using
  * setTimeout at a time.
@@ -156,10 +153,7 @@ function plInit() {
       forceCC = false;
     }
 
-    gIOS = Cc["@mozilla.org/network/io-service;1"]
-      .getService(Ci.nsIIOService);
-
-    var fileURI = gIOS.newURI(manifestURI);
+    var fileURI = Services.io.newURI(manifestURI);
     pages = plLoadURLsFromURI(fileURI);
 
     if (!pages) {
@@ -181,8 +175,6 @@ function plInit() {
     }
 
     // Create a new chromed browser window for content
-    var wwatch = Cc["@mozilla.org/embedcomp/window-watcher;1"]
-      .getService(Ci.nsIWindowWatcher);
     var blank = Cc["@mozilla.org/supports-string;1"]
       .createInstance(Ci.nsISupportsString);
     blank.data = "about:blank";
@@ -192,7 +184,7 @@ function plInit() {
       toolbars = "titlebar,resizable";
     }
 
-    browserWindow = wwatch.openWindow(null, "chrome://browser/content/", "_blank",
+    browserWindow = Services.ww.openWindow(null, "chrome://browser/content/", "_blank",
        `chrome,${toolbars},dialog=no,width=${winWidth},height=${winHeight}`, blank);
 
     gPaintWindow = browserWindow;
@@ -833,7 +825,7 @@ function plLoadURLsFromURI(manifestUri) {
         return null;
       }
 
-      var subManifest = gIOS.newURI(items[1], null, manifestUri);
+      var subManifest = Services.io.newURI(items[1], null, manifestUri);
       if (subManifest == null) {
         dumpLine("tp: invalid URI on line " + manifestUri.spec + ":" + lineNo + " : '" + line.value + "'");
         return null;
@@ -886,7 +878,7 @@ function plLoadURLsFromURI(manifestUri) {
       var url;
 
       if (!baseVsRef) {
-        url = gIOS.newURI(urlspec, null, manifestUri);
+        url = Services.io.newURI(urlspec, null, manifestUri);
 
         if (pageFilterRegexp && !pageFilterRegexp.test(url.spec))
           continue;
@@ -898,13 +890,13 @@ function plLoadURLsFromURI(manifestUri) {
         // page; later on this 'pre' is used when recording the actual time value/result; because in
         // the results we use the url as the results key; but we might use the same test page as a reference
         // page in the same test suite, so we need to add a prefix so this results key is always unique
-        url = gIOS.newURI(urlspecBase, null, manifestUri);
+        url = Services.io.newURI(urlspecBase, null, manifestUri);
         if (pageFilterRegexp && !pageFilterRegexp.test(url.spec))
           continue;
         var pre = "base_page_" + baseVsRefIndex + "_";
         url_array.push({ url, flags, pre });
 
-        url = gIOS.newURI(urlspecRef, null, manifestUri);
+        url = Services.io.newURI(urlspecRef, null, manifestUri);
         if (pageFilterRegexp && !pageFilterRegexp.test(url.spec))
           continue;
         pre = "ref_page_" + baseVsRefIndex + "_";
@@ -922,4 +914,3 @@ function dumpLine(str) {
   dump(str);
   dump("\n");
 }
-
diff --git a/testing/talos/talos/pageloader/chrome/quit.js b/testing/talos/talos/pageloader/chrome/quit.js
index 97ab376c03b59..3e23e473a36b4 100644
--- a/testing/talos/talos/pageloader/chrome/quit.js
+++ b/testing/talos/talos/pageloader/chrome/quit.js
@@ -40,17 +40,13 @@
   These files did not have a license
 */
 
-function canQuitApplication() {
-  var os = Components.classes["@mozilla.org/observer-service;1"]
-    .getService(Components.interfaces.nsIObserverService);
-  if (!os) {
-    return true;
-  }
+/* import-globals-from pageloader.js */
 
+function canQuitApplication() {
   try {
     var cancelQuit = Components.classes["@mozilla.org/supports-PRBool;1"]
       .createInstance(Components.interfaces.nsISupportsPRBool);
-    os.notifyObservers(cancelQuit, "quit-application-requested");
+    Services.obs.notifyObservers(cancelQuit, "quit-application-requested");
 
     // Something aborted the quit process.
     if (cancelQuit.data) {
@@ -72,12 +68,10 @@ function goQuitApplication() {
   var forceQuit;
 
   if (kAppStartup in Components.classes) {
-    appService = Components.classes[kAppStartup].
-      getService(Components.interfaces.nsIAppStartup);
+    appService = Services.startup;
     forceQuit  = Components.interfaces.nsIAppStartup.eForceQuit;
   } else if (kAppShell in Components.classes) {
-    appService = Components.classes[kAppShell].
-      getService(Components.interfaces.nsIAppShellService);
+    appService = Services.appShell;
     forceQuit = Components.interfaces.nsIAppShellService.eForceQuit;
   } else {
     throw "goQuitApplication: no AppStartup/appShell";
@@ -91,4 +85,3 @@ function goQuitApplication() {
 
   return true;
 }
-
diff --git a/testing/talos/talos/scripts/MozillaFileLogger.js b/testing/talos/talos/scripts/MozillaFileLogger.js
index 25a303b36609e..0d8ee9ced786a 100644
--- a/testing/talos/talos/scripts/MozillaFileLogger.js
+++ b/testing/talos/talos/scripts/MozillaFileLogger.js
@@ -116,8 +116,9 @@ MozFileLogger.close = function() {
 };
 
 try {
-  var prefs = Components.classes["@mozilla.org/preferences-service;1"]
-    .getService(Components.interfaces.nsIPrefBranch);
-  var filename = prefs.getCharPref("talos.logfile");
+  // ChromeUtils is not available in this scope.
+  // eslint-disable-next-line mozilla/use-chromeutils-import
+  Cu.import("resource://gre/modules/Services.jsm");
+  var filename = Services.prefs.getCharPref("talos.logfile");
   MozFileLogger.init(filename);
 } catch (ex) {} // pref does not exist, return empty string
diff --git a/testing/talos/talos/scripts/Profiler.js b/testing/talos/talos/scripts/Profiler.js
index be6300e0f6a20..a80fa93c65ae8 100644
--- a/testing/talos/talos/scripts/Profiler.js
+++ b/testing/talos/talos/scripts/Profiler.js
@@ -44,6 +44,7 @@ var Profiler;
   } catch (e) {}
 
   try {
+    // eslint-disable-next-line mozilla/use-services
     _profiler = Components.classes["@mozilla.org/tools/profiler;1"].getService(Components.interfaces.nsIProfiler);
   } catch (ex) { (typeof(dumpLog) == "undefined" ? dump : dumpLog)(ex + "\n"); }
 
diff --git a/testing/talos/talos/startup_test/tresize/addon/content/Profiler.js b/testing/talos/talos/startup_test/tresize/addon/content/Profiler.js
index be6300e0f6a20..a80fa93c65ae8 100644
--- a/testing/talos/talos/startup_test/tresize/addon/content/Profiler.js
+++ b/testing/talos/talos/startup_test/tresize/addon/content/Profiler.js
@@ -44,6 +44,7 @@ var Profiler;
   } catch (e) {}
 
   try {
+    // eslint-disable-next-line mozilla/use-services
     _profiler = Components.classes["@mozilla.org/tools/profiler;1"].getService(Components.interfaces.nsIProfiler);
   } catch (ex) { (typeof(dumpLog) == "undefined" ? dump : dumpLog)(ex + "\n"); }
 
diff --git a/testing/talos/talos/startup_test/tspaint_test.html b/testing/talos/talos/startup_test/tspaint_test.html
index 3b41ab874c2b0..a66e0e8598624 100755
--- a/testing/talos/talos/startup_test/tspaint_test.html
+++ b/testing/talos/talos/startup_test/tspaint_test.html
@@ -41,8 +41,10 @@
 
   try {
     netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
-    var consoleService = Components.classes["@mozilla.org/consoleservice;1"].getService(Components.interfaces.nsIConsoleService);
-    consoleService.getMessageArray(messages, {});
+    // ChromeUtils is not available in this scope.
+    // eslint-disable-next-line mozilla/use-chromeutils-import
+    Cu.import("resource://gre/modules/Services.jsm");
+    Services.console.getMessageArray(messages, {});
   } catch (ex) {
     dumpLog(ex + "\n");
   }
diff --git a/testing/talos/talos/talos-powers/chrome/talos-powers-content.js b/testing/talos/talos/talos-powers/chrome/talos-powers-content.js
index 547bf66031343..808ec4b6e9ee8 100644
--- a/testing/talos/talos/talos-powers/chrome/talos-powers-content.js
+++ b/testing/talos/talos/talos-powers/chrome/talos-powers-content.js
@@ -3,20 +3,16 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 // This file is loaded as a framescript
+/* global docShell */
+// eslint-env mozilla/frame-script
 
-/* globals docShell */
+ChromeUtils.import("resource://gre/modules/Services.jsm");
 
 function canQuitApplication() {
-  var os = Components.classes["@mozilla.org/observer-service;1"]
-    .getService(Components.interfaces.nsIObserverService);
-  if (!os) {
-    return true;
-  }
-
   try {
     var cancelQuit = Components.classes["@mozilla.org/supports-PRBool;1"]
       .createInstance(Components.interfaces.nsISupportsPRBool);
-    os.notifyObservers(cancelQuit, "quit-application-requested");
+    Services.obs.notifyObservers(cancelQuit, "quit-application-requested");
 
     // Something aborted the quit process.
     if (cancelQuit.data) {
@@ -24,14 +20,12 @@ function canQuitApplication() {
     }
   } catch (ex) {
   }
-  os.notifyObservers(null, "quit-application-granted");
+  Services.obs.notifyObservers(null, "quit-application-granted");
   return true;
 }
 
 function goQuitApplication(waitForSafeBrowsing) {
-  var xulRuntime = Components.classes["@mozilla.org/xre/app-info;1"]
-                 .getService(Components.interfaces.nsIXULRuntime);
-  if (xulRuntime.processType == xulRuntime.PROCESS_TYPE_CONTENT) {
+  if (Services.appinfo.processType == Services.appinfo.PROCESS_TYPE_CONTENT) {
     // If we're running in a remote browser, emit an event for a
     // frame script to pick up to quit the whole browser.
     var event = new content.CustomEvent("TalosQuitApplication", {bubbles: true, detail: {waitForSafeBrowsing}});
@@ -61,12 +55,9 @@ function goQuitApplication(waitForSafeBrowsing) {
   var appService;
 
   if (kAppStartup in Components.classes) {
-    appService = Components.classes[kAppStartup].
-      getService(Components.interfaces.nsIAppStartup);
-
+    appService = Services.startup;
   } else if (kAppShell in Components.classes) {
-    appService = Components.classes[kAppShell].
-      getService(Components.interfaces.nsIAppShellService);
+    appService = Services.appShell;
   } else {
     throw "goQuitApplication: no AppStartup/appShell";
   }
diff --git a/testing/talos/talos/tests/devtools/addon/content/Profiler.js b/testing/talos/talos/tests/devtools/addon/content/Profiler.js
index be6300e0f6a20..a80fa93c65ae8 100644
--- a/testing/talos/talos/tests/devtools/addon/content/Profiler.js
+++ b/testing/talos/talos/tests/devtools/addon/content/Profiler.js
@@ -44,6 +44,7 @@ var Profiler;
   } catch (e) {}
 
   try {
+    // eslint-disable-next-line mozilla/use-services
     _profiler = Components.classes["@mozilla.org/tools/profiler;1"].getService(Components.interfaces.nsIProfiler);
   } catch (ex) { (typeof(dumpLog) == "undefined" ? dump : dumpLog)(ex + "\n"); }
 
diff --git a/testing/talos/talos/tests/devtools/addon/content/damp.js b/testing/talos/talos/tests/devtools/addon/content/damp.js
index 0bf14fed18b61..9bcba6b24c19a 100644
--- a/testing/talos/talos/tests/devtools/addon/content/damp.js
+++ b/testing/talos/talos/tests/devtools/addon/content/damp.js
@@ -1057,8 +1057,7 @@ async _consoleOpenWithCachedMessagesTest() {
     };
     this._config = config;
 
-    var wm = Components.classes["@mozilla.org/appshell/window-mediator;1"].getService(Ci.nsIWindowMediator);
-    this._win = wm.getMostRecentWindow("navigator:browser");
+    this._win = Services.wm.getMostRecentWindow("navigator:browser");
     this._dampTab = this._win.gBrowser.selectedTab;
     this._win.gBrowser.selectedBrowser.focus(); // Unfocus the URL bar to avoid caret blink
 
diff --git a/testing/talos/talos/tests/tart/addon/content/Profiler.js b/testing/talos/talos/tests/tart/addon/content/Profiler.js
index be6300e0f6a20..a80fa93c65ae8 100644
--- a/testing/talos/talos/tests/tart/addon/content/Profiler.js
+++ b/testing/talos/talos/tests/tart/addon/content/Profiler.js
@@ -44,6 +44,7 @@ var Profiler;
   } catch (e) {}
 
   try {
+    // eslint-disable-next-line mozilla/use-services
     _profiler = Components.classes["@mozilla.org/tools/profiler;1"].getService(Components.interfaces.nsIProfiler);
   } catch (ex) { (typeof(dumpLog) == "undefined" ? dump : dumpLog)(ex + "\n"); }
 
diff --git a/testing/talos/talos/tests/tart/addon/content/tart.js b/testing/talos/talos/tests/tart/addon/content/tart.js
index bef4d7d2c93ea..f0d8bc89b7d4c 100644
--- a/testing/talos/talos/tests/tart/addon/content/tart.js
+++ b/testing/talos/talos/tests/tart/addon/content/tart.js
@@ -683,8 +683,7 @@ Tart.prototype = {
     };
     this._config = config;
 
-    var wm = Components.classes["@mozilla.org/appshell/window-mediator;1"].getService(Ci.nsIWindowMediator);
-    this._win = wm.getMostRecentWindow("navigator:browser");
+    this._win = Services.wm.getMostRecentWindow("navigator:browser");
     this._tartTab = this._win.gBrowser.selectedTab;
     this._win.gBrowser.selectedBrowser.focus(); // Unfocus the URL bar to avoid caret blink
 
diff --git a/testing/xpcshell/example/unit/check_profile.js b/testing/xpcshell/example/unit/check_profile.js
index 799940a00875e..7f32dce086ba9 100644
--- a/testing/xpcshell/example/unit/check_profile.js
+++ b/testing/xpcshell/example/unit/check_profile.js
@@ -2,12 +2,12 @@
  * 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/. */
 
+ChromeUtils.import("resource://gre/modules/Services.jsm");
+
 function check_profile_dir(profd) {
   Assert.ok(profd.exists());
   Assert.ok(profd.isDirectory());
-  let dirSvc = Cc["@mozilla.org/file/directory_service;1"]
-                 .getService(Ci.nsIProperties);
-  let profd2 = dirSvc.get("ProfD", Ci.nsIFile);
+  let profd2 = Services.dirsvc.get("ProfD", Ci.nsIFile);
   Assert.ok(profd2.exists());
   Assert.ok(profd2.isDirectory());
   // make sure we got the same thing back...
@@ -21,10 +21,8 @@ function check_do_get_profile(fireProfileAfterChange) {
   ]);
   const expectedTopics = new Map(observedTopics);
 
-  const obs = Cc["@mozilla.org/observer-service;1"]
-                   .getService(Ci.nsIObserverService);
   for (let [topic, ] of observedTopics) {
-    obs.addObserver(() => {
+    Services.obs.addObserver(() => {
       let val = observedTopics.get(topic) + 1;
       observedTopics.set(topic, val);
     }, topic);
diff --git a/testing/xpcshell/head.js b/testing/xpcshell/head.js
index 97b1da696448d..4a02aa982efea 100644
--- a/testing/xpcshell/head.js
+++ b/testing/xpcshell/head.js
@@ -35,9 +35,9 @@ var _XPCSHELL_PROCESS;
 
 // Register the testing-common resource protocol early, to have access to its
 // modules.
+var _Services = ChromeUtils.import("resource://gre/modules/Services.jsm", {}).Services;
 _register_modules_protocol_handler();
 
-var _Promise = ChromeUtils.import("resource://gre/modules/Promise.jsm", {}).Promise;
 var _PromiseTestUtils = ChromeUtils.import("resource://testing-common/PromiseTestUtils.jsm", {}).PromiseTestUtils;
 var _Task = ChromeUtils.import("resource://gre/modules/Task.jsm", {}).Task;
 
@@ -71,19 +71,18 @@ var _testLogger = new _LoggerClass("xpcshell/head.js", _dumpLog, [_add_params]);
 
 // Disable automatic network detection, so tests work correctly when
 // not connected to a network.
-{
-  let ios = Components.classes["@mozilla.org/network/io-service;1"]
-                      .getService(Components.interfaces.nsIIOService);
-  ios.manageOfflineStatus = false;
-  ios.offline = false;
-}
+_Services.io.manageOfflineStatus = false;
+_Services.io.offline = false;
 
 // Determine if we're running on parent or child
 var runningInParent = true;
 try {
+  // Don't use Services.appinfo here as it disables replacing appinfo with stubs
+  // for test usage.
+  // eslint-disable-next-line mozilla/use-services
   runningInParent = Components.classes["@mozilla.org/xre/runtime;1"].
-                    getService(Components.interfaces.nsIXULRuntime).processType
-                    == Components.interfaces.nsIXULRuntime.PROCESS_TYPE_DEFAULT;
+                      getService(Components.interfaces.nsIXULRuntime).processType
+                      == Components.interfaces.nsIXULRuntime.PROCESS_TYPE_DEFAULT;
 } catch (e) { }
 
 // Only if building of places is enabled.
@@ -91,23 +90,18 @@ if (runningInParent &&
     "mozIAsyncHistory" in Components.interfaces) {
   // Ensure places history is enabled for xpcshell-tests as some non-FF
   // apps disable it.
-  let prefs = Components.classes["@mozilla.org/preferences-service;1"]
-              .getService(Components.interfaces.nsIPrefBranch);
-  prefs.setBoolPref("places.history.enabled", true);
+  _Services.prefs.setBoolPref("places.history.enabled", true);
 }
 
 try {
   if (runningInParent) {
-    let prefs = Components.classes["@mozilla.org/preferences-service;1"]
-                .getService(Components.interfaces.nsIPrefBranch);
-
     // disable necko IPC security checks for xpcshell, as they lack the
     // docshells needed to pass them
-    prefs.setBoolPref("network.disable.ipc.security", true);
+    _Services.prefs.setBoolPref("network.disable.ipc.security", true);
 
     // Disable IPv6 lookups for 'localhost' on windows.
     if ("@mozilla.org/windows-registry-key;1" in Components.classes) {
-      prefs.setCharPref("network.dns.ipv4OnlyDomains", "localhost");
+      _Services.prefs.setCharPref("network.dns.ipv4OnlyDomains", "localhost");
     }
   }
 } catch (e) { }
@@ -149,6 +143,9 @@ try {
         info("CONSOLE_MESSAGE: (" + levelNames[msg.logLevel] + ") " + msg.toString());
     }
   };
+  // Don't use _Services.console here as it causes one of the devtools tests
+  // to fail, probably due to initializing Services.console too early.
+  // eslint-disable-next-line mozilla/use-services
   Components.classes["@mozilla.org/consoleservice;1"]
             .getService(Components.interfaces.nsIConsoleService)
             .registerListener(listener);
@@ -331,13 +328,11 @@ function do_get_idle() {
 // Map resource://test/ to current working directory and
 // resource://testing-common/ to the shared test modules directory.
 function _register_protocol_handlers() {
-  let ios = Components.classes["@mozilla.org/network/io-service;1"]
-                      .getService(Components.interfaces.nsIIOService);
   let protocolHandler =
-    ios.getProtocolHandler("resource")
-       .QueryInterface(Components.interfaces.nsIResProtocolHandler);
+    _Services.io.getProtocolHandler("resource")
+                .QueryInterface(Components.interfaces.nsIResProtocolHandler);
 
-  let curDirURI = ios.newFileURI(do_get_cwd());
+  let curDirURI = _Services.io.newFileURI(do_get_cwd());
   protocolHandler.setSubstitution("test", curDirURI);
 
   _register_modules_protocol_handler();
@@ -350,11 +345,9 @@ function _register_modules_protocol_handler() {
                     "head.js is included.");
   }
 
-  let ios = Components.classes["@mozilla.org/network/io-service;1"]
-                      .getService(Components.interfaces.nsIIOService);
   let protocolHandler =
-    ios.getProtocolHandler("resource")
-       .QueryInterface(Components.interfaces.nsIResProtocolHandler);
+    _Services.io.getProtocolHandler("resource")
+                .QueryInterface(Components.interfaces.nsIResProtocolHandler);
 
   let modulesFile = Components.classes["@mozilla.org/file/local;1"].
                     createInstance(Components.interfaces.nsIFile);
@@ -370,7 +363,7 @@ function _register_modules_protocol_handler() {
                     _TESTING_MODULES_DIR);
   }
 
-  let modulesURI = ios.newFileURI(modulesFile);
+  let modulesURI = _Services.io.newFileURI(modulesFile);
 
   protocolHandler.setSubstitution("testing-common", modulesURI);
 }
@@ -378,20 +371,17 @@ function _register_modules_protocol_handler() {
 /* Debugging support */
 // Used locally and by our self-tests.
 function _setupDebuggerServer(breakpointFiles, callback) {
-  let prefs = Components.classes["@mozilla.org/preferences-service;1"]
-              .getService(Components.interfaces.nsIPrefBranch);
-
   // Always allow remote debugging.
-  prefs.setBoolPref("devtools.debugger.remote-enabled", true);
+  _Services.prefs.setBoolPref("devtools.debugger.remote-enabled", true);
 
   // for debugging-the-debugging, let an env var cause log spew.
   let env = Components.classes["@mozilla.org/process/environment;1"]
                       .getService(Components.interfaces.nsIEnvironment);
   if (env.get("DEVTOOLS_DEBUGGER_LOG")) {
-    prefs.setBoolPref("devtools.debugger.log", true);
+    _Services.prefs.setBoolPref("devtools.debugger.log", true);
   }
   if (env.get("DEVTOOLS_DEBUGGER_LOG_VERBOSE")) {
-    prefs.setBoolPref("devtools.debugger.log.verbose", true);
+    _Services.prefs.setBoolPref("devtools.debugger.log.verbose", true);
   }
 
   let require;
@@ -417,9 +407,6 @@ function _setupDebuggerServer(breakpointFiles, callback) {
 
   // An observer notification that tells us when we can "resume" script
   // execution.
-  let obsSvc = Components.classes["@mozilla.org/observer-service;1"].
-               getService(Components.interfaces.nsIObserverService);
-
   const TOPICS = ["devtools-thread-resumed", "xpcshell-test-devtools-shutdown"];
   let observe = function(subject, topic, data) {
     switch (topic) {
@@ -444,13 +431,13 @@ function _setupDebuggerServer(breakpointFiles, callback) {
         break;
     }
     for (let topicToRemove of TOPICS) {
-      obsSvc.removeObserver(observe, topicToRemove);
+      _Services.obs.removeObserver(observe, topicToRemove);
     }
     callback();
   };
 
   for (let topic of TOPICS) {
-    obsSvc.addObserver(observe, topic);
+    _Services.obs.addObserver(observe, topic);
   }
   return DebuggerServer;
 }
@@ -619,12 +606,10 @@ function _execute_test() {
   if (_profileInitialized) {
     // Since we have a profile, we will notify profile shutdown topics at
     // the end of the current test, to ensure correct cleanup on shutdown.
-    let obs = Components.classes["@mozilla.org/observer-service;1"]
-                        .getService(Components.interfaces.nsIObserverService);
-    obs.notifyObservers(null, "profile-change-net-teardown");
-    obs.notifyObservers(null, "profile-change-teardown");
-    obs.notifyObservers(null, "profile-before-change");
-    obs.notifyObservers(null, "profile-before-change-qm");
+    _Services.obs.notifyObservers(null, "profile-change-net-teardown");
+    _Services.obs.notifyObservers(null, "profile-change-teardown");
+    _Services.obs.notifyObservers(null, "profile-before-change");
+    _Services.obs.notifyObservers(null, "profile-before-change-qm");
 
     _profileInitialized = false;
   }
@@ -694,10 +679,8 @@ function do_timeout(delay, func) {
 function executeSoon(callback, aName) {
   let funcName = (aName ? aName : callback.name);
   do_test_pending(funcName);
-  var tm = Components.classes["@mozilla.org/thread-manager;1"]
-                     .getService(Components.interfaces.nsIThreadManager);
 
-  tm.dispatchToMainThread({
+  _Services.tm.dispatchToMainThread({
     run() {
       try {
         callback();
@@ -982,9 +965,7 @@ function do_test_finished(aName) {
 
 function do_get_file(path, allowNonexistent) {
   try {
-    let lf = Components.classes["@mozilla.org/file/directory_service;1"]
-      .getService(Components.interfaces.nsIProperties)
-      .get("CurWorkD", Components.interfaces.nsIFile);
+    let lf = _Services.dirsvc.get("CurWorkD", Components.interfaces.nsIFile);
 
     let bits = path.split("/");
     for (let i = 0; i < bits.length; i++) {
@@ -1046,10 +1027,8 @@ function do_parse_document(aPath, aType) {
                Components.stack.caller);
   }
 
-  let file = do_get_file(aPath),
-      ios = Components.classes["@mozilla.org/network/io-service;1"]
-            .getService(Components.interfaces.nsIIOService),
-      url = ios.newFileURI(file).spec;
+  let file = do_get_file(aPath);
+  let url = _Services.io.newFileURI(file).spec;
   file = null;
   return new Promise((resolve, reject) => {
     let xhr = new XMLHttpRequest();
@@ -1131,8 +1110,6 @@ function do_get_profile(notifyProfileAfterChange = false) {
                        .createInstance(Components.interfaces.nsIFile);
   file.initWithPath(profd);
 
-  let dirSvc = Components.classes["@mozilla.org/file/directory_service;1"]
-                         .getService(Components.interfaces.nsIProperties);
   let provider = {
     getFile(prop, persistent) {
       persistent.value = true;
@@ -1150,11 +1127,8 @@ function do_get_profile(notifyProfileAfterChange = false) {
       throw Components.results.NS_ERROR_NO_INTERFACE;
     }
   };
-  dirSvc.QueryInterface(Components.interfaces.nsIDirectoryService)
-        .registerProvider(provider);
-
-  let obsSvc = Components.classes["@mozilla.org/observer-service;1"].
-        getService(Components.interfaces.nsIObserverService);
+  _Services.dirsvc.QueryInterface(Components.interfaces.nsIDirectoryService)
+           .registerProvider(provider);
 
   // We need to update the crash events directory when the profile changes.
   if (runningInParent &&
@@ -1166,10 +1140,10 @@ function do_get_profile(notifyProfileAfterChange = false) {
   }
 
   if (!_profileInitialized) {
-    obsSvc.notifyObservers(null, "profile-do-change", "xpcshell-do-get-profile");
+    _Services.obs.notifyObservers(null, "profile-do-change", "xpcshell-do-get-profile");
     _profileInitialized = true;
     if (notifyProfileAfterChange) {
-      obsSvc.notifyObservers(null, "profile-after-change", "xpcshell-do-get-profile");
+      _Services.obs.notifyObservers(null, "profile-after-change", "xpcshell-do-get-profile");
     }
   }
 
@@ -1177,9 +1151,7 @@ function do_get_profile(notifyProfileAfterChange = false) {
   // to avoid spurious leak reports.
   env = null;
   profd = null;
-  dirSvc = null;
   provider = null;
-  obsSvc = null;
   return file.clone();
 }
 
@@ -1493,26 +1465,20 @@ try {
   if (runningInParent) {
     // Always use network provider for geolocation tests
     // so we bypass the OSX dialog raised by the corelocation provider
-    let prefs = Components.classes["@mozilla.org/preferences-service;1"]
-      .getService(Components.interfaces.nsIPrefBranch);
-
-    prefs.setBoolPref("geo.provider.testing", true);
+    _Services.prefs.setBoolPref("geo.provider.testing", true);
   }
 } catch (e) { }
 // We need to avoid hitting the network with certain components.
 try {
   if (runningInParent) {
-    let prefs = Components.classes["@mozilla.org/preferences-service;1"]
-      .getService(Components.interfaces.nsIPrefBranch);
-
-    prefs.setCharPref("media.gmp-manager.url.override", "http://%(server)s/dummy-gmp-manager.xml");
-    prefs.setCharPref("media.gmp-manager.updateEnabled", false);
-    prefs.setCharPref("extensions.systemAddon.update.url", "http://%(server)s/dummy-system-addons.xml");
-    prefs.setCharPref("extensions.shield-recipe-client.api_url",
-                      "https://%(server)s/selfsupport-dummy/");
-    prefs.setCharPref("toolkit.telemetry.server", "https://%(server)s/telemetry-dummy");
-    prefs.setCharPref("browser.search.geoip.url", "https://%(server)s/geoip-dummy");
-    prefs.setCharPref("browser.safebrowsing.downloads.remote.url", "https://%(server)s/safebrowsing-dummy");
+    _Services.prefs.setCharPref("media.gmp-manager.url.override", "http://%(server)s/dummy-gmp-manager.xml");
+    _Services.prefs.setCharPref("media.gmp-manager.updateEnabled", false);
+    _Services.prefs.setCharPref("extensions.systemAddon.update.url", "http://%(server)s/dummy-system-addons.xml");
+    _Services.prefs.setCharPref("extensions.shield-recipe-client.api_url",
+                                "https://%(server)s/selfsupport-dummy/");
+    _Services.prefs.setCharPref("toolkit.telemetry.server", "https://%(server)s/telemetry-dummy");
+    _Services.prefs.setCharPref("browser.search.geoip.url", "https://%(server)s/geoip-dummy");
+    _Services.prefs.setCharPref("browser.safebrowsing.downloads.remote.url", "https://%(server)s/safebrowsing-dummy");
   }
 } catch (e) { }
 
@@ -1520,11 +1486,8 @@ try {
 // selected by default).
 try {
   if (runningInParent) {
-    let prefs = Components.classes["@mozilla.org/preferences-service;1"]
-      .getService(Components.interfaces.nsIPrefBranch);
-
-    prefs.deleteBranch("lightweightThemes.selectedThemeID");
-    prefs.deleteBranch("browser.devedition.theme.enabled");
+    _Services.prefs.deleteBranch("lightweightThemes.selectedThemeID");
+    _Services.prefs.deleteBranch("browser.devedition.theme.enabled");
   }
 } catch (e) { }