--- a/browser/extensions/formautofill/FormAutofillParent.jsm
+++ b/browser/extensions/formautofill/FormAutofillParent.jsm
@@ -22,17 +22,19 @@
  *   {
  *     // ...
  *   }
  * ]
  */
 
 "use strict";
 
-this.EXPORTED_SYMBOLS = ["FormAutofillParent"];
+// We expose a singleton from this module. Some tests may import the
+// constructor via a backstage pass.
+this.EXPORTED_SYMBOLS = ["formAutofillParent"];
 
 const {classes: Cc, interfaces: Ci, utils: Cu, results: Cr} = Components;
 
 Cu.import("resource://gre/modules/Services.jsm");
 Cu.import("resource://gre/modules/XPCOMUtils.jsm");
 
 Cu.import("resource://formautofill/FormAutofillUtils.jsm");
 
@@ -74,19 +76,39 @@ FormAutofillParent.prototype = {
   QueryInterface: XPCOMUtils.generateQI([Ci.nsISupports, Ci.nsIObserver]),
 
   /**
    * Cache of the Form Autofill status (considering preferences and storage).
    */
   _active: null,
 
   /**
+   * The status of Form Autofill's initialization.
+   */
+  _initialized: false,
+
+  /**
+   * Exposes the status of Form Autofill's initialization. It can be used to
+   * determine whether Form Autofill is available for current users.
+   *
+   * @returns {boolean} Whether FormAutofillParent is initialized.
+   */
+  get initialized() {
+    return this._initialized;
+  },
+
+  /**
    * Initializes ProfileStorage and registers the message handler.
    */
   async init() {
+    if (this._initialized) {
+      return;
+    }
+    this._initialized = true;
+
     Services.obs.addObserver(this, "sync-pane-loaded");
     Services.ppmm.addMessageListener("FormAutofill:InitStorage", this);
     Services.ppmm.addMessageListener("FormAutofill:GetRecords", this);
     Services.ppmm.addMessageListener("FormAutofill:SaveAddress", this);
     Services.ppmm.addMessageListener("FormAutofill:RemoveAddresses", this);
     Services.ppmm.addMessageListener("FormAutofill:OpenPreferences", this);
     Services.mm.addMessageListener("FormAutofill:OnFormSubmit", this);
 
@@ -547,8 +569,10 @@ FormAutofillParent.prototype = {
   _recordFormFillingTime(formType, fillingType, startedFillingMS) {
     if (!startedFillingMS) {
       return;
     }
     let histogram = Services.telemetry.getKeyedHistogramById("FORM_FILLING_REQUIRED_TIME_MS");
     histogram.add(`${formType}-${fillingType}`, Date.now() - startedFillingMS);
   },
 };
+
+this.formAutofillParent = new FormAutofillParent();

--- a/browser/extensions/formautofill/bootstrap.js
+++ b/browser/extensions/formautofill/bootstrap.js
@@ -11,17 +11,17 @@ const STYLESHEET_URI = "chrome://formaut
 const CACHED_STYLESHEETS = new WeakMap();
 
 Cu.import("resource://gre/modules/Services.jsm");
 Cu.import("resource://gre/modules/XPCOMUtils.jsm");
 
 XPCOMUtils.defineLazyModuleGetter(this, "AddonManager", "resource://gre/modules/AddonManager.jsm");
 XPCOMUtils.defineLazyModuleGetter(this, "AddonManagerPrivate",
                                   "resource://gre/modules/AddonManager.jsm");
-XPCOMUtils.defineLazyModuleGetter(this, "FormAutofillParent",
+XPCOMUtils.defineLazyModuleGetter(this, "formAutofillParent",
                                   "resource://formautofill/FormAutofillParent.jsm");
 XPCOMUtils.defineLazyModuleGetter(this, "FormAutofillUtils",
                                   "resource://formautofill/FormAutofillUtils.jsm");
 
 function insertStyleSheet(domWindow, url) {
   let doc = domWindow.document;
   let styleSheetAttr = `href="${url}" type="text/css"`;
   let styleSheet = doc.createProcessingInstruction("xml-stylesheet", styleSheetAttr);
@@ -105,18 +105,17 @@ function startup(data) {
     Services.prefs.setBoolPref("services.sync.engine.creditcards.available", true);
   } else {
     Services.prefs.clearUserPref("services.sync.engine.creditcards.available");
   }
 
   // Listen for the autocomplete popup message to lazily append our stylesheet related to the popup.
   Services.mm.addMessageListener("FormAutoComplete:MaybeOpenPopup", onMaybeOpenPopup);
 
-  let parent = new FormAutofillParent();
-  parent.init().catch(Cu.reportError);
+  formAutofillParent.init().catch(Cu.reportError);
   Services.ppmm.loadProcessScript("data:,new " + function() {
     Components.utils.import("resource://formautofill/FormAutofillContent.jsm");
   }, true);
   Services.mm.loadFrameScript("chrome://formautofill/content/FormAutofillFrameScript.js", true);
 }
 
 function shutdown() {
   Services.mm.removeMessageListener("FormAutoComplete:MaybeOpenPopup", onMaybeOpenPopup);

--- a/browser/extensions/formautofill/test/unit/test_activeStatus.js
+++ b/browser/extensions/formautofill/test/unit/test_activeStatus.js
@@ -1,15 +1,15 @@
 /*
  * Test for status handling in Form Autofill Parent.
  */
 
 "use strict";
 
-Cu.import("resource://formautofill/FormAutofillParent.jsm");
+let {FormAutofillParent} = Cu.import("resource://formautofill/FormAutofillParent.jsm", {});
 Cu.import("resource://formautofill/ProfileStorage.jsm");
 
 add_task(async function test_activeStatus_init() {
   let formAutofillParent = new FormAutofillParent();
   sinon.spy(formAutofillParent, "_updateStatus");
 
   // Default status is null before initialization
   do_check_eq(formAutofillParent._active, null);

--- a/browser/extensions/formautofill/test/unit/test_getRecords.js
+++ b/browser/extensions/formautofill/test/unit/test_getRecords.js
@@ -1,15 +1,15 @@
 /*
  * Test for make sure getRecords can retrieve right collection from storage.
  */
 
 "use strict";
 
-Cu.import("resource://formautofill/FormAutofillParent.jsm");
+let {FormAutofillParent} = Cu.import("resource://formautofill/FormAutofillParent.jsm", {});
 Cu.import("resource://formautofill/MasterPassword.jsm");
 Cu.import("resource://formautofill/ProfileStorage.jsm");
 
 const TEST_ADDRESS_1 = {
   "given-name": "Timothy",
   "additional-name": "John",
   "family-name": "Berners-Lee",
   organization: "World Wide Web Consortium",

--- a/browser/extensions/formautofill/test/unit/test_savedFieldNames.js
+++ b/browser/extensions/formautofill/test/unit/test_savedFieldNames.js
@@ -1,15 +1,15 @@
 /*
  * Test for keeping the valid fields information in initialProcessData.
  */
 
 "use strict";
 
-Cu.import("resource://formautofill/FormAutofillParent.jsm");
+let {FormAutofillParent} = Cu.import("resource://formautofill/FormAutofillParent.jsm", {});
 Cu.import("resource://formautofill/ProfileStorage.jsm");
 
 add_task(async function test_profileSavedFieldNames_init() {
   let formAutofillParent = new FormAutofillParent();
   sinon.stub(formAutofillParent, "_updateSavedFieldNames");
 
   await formAutofillParent.init();
   await formAutofillParent.profileStorage.initialize();