--- a/browser/components/nsBrowserGlue.js
+++ b/browser/components/nsBrowserGlue.js
@@ -141,16 +141,19 @@ const listeners = {
   mm: {
     "AboutHome:MaybeShowAutoMigrationUndoNotification": ["AboutHome"],
     "AboutHome:RequestUpdate": ["AboutHome"],
     "Content:Click": ["ContentClick"],
     "ContentSearch": ["ContentSearch"],
     "FormValidation:ShowPopup": ["FormValidationHandler"],
     "FormValidation:HidePopup": ["FormValidationHandler"],
     "Prompt:Open": ["RemotePrompt"],
+    "Reader:ArticleGet": ["ReaderParent"],
+    "Reader:FaviconRequest": ["ReaderParent"],
+    "Reader:UpdateReaderButton": ["ReaderParent"],
     // PLEASE KEEP THIS LIST IN SYNC WITH THE LISTENERS ADDED IN LoginManagerParent.init
     "RemoteLogins:findLogins": ["LoginManagerParent"],
     "RemoteLogins:findRecipes": ["LoginManagerParent"],
     "RemoteLogins:onFormSubmit": ["LoginManagerParent"],
     "RemoteLogins:autoCompleteLogins": ["LoginManagerParent"],
     "RemoteLogins:removeLogin": ["LoginManagerParent"],
     "RemoteLogins:insecureLoginFormPresent": ["LoginManagerParent"],
     // PLEASE KEEP THIS LIST IN SYNC WITH THE LISTENERS ADDED IN LoginManagerParent.init
@@ -602,18 +605,16 @@ BrowserGlue.prototype = {
     NewTabUtils.init();
     NewTabUtils.links.addProvider(DirectoryLinksProvider);
     AboutNewTab.init();
 
     SessionStore.init();
     BrowserUsageTelemetry.init();
     BrowserUITelemetry.init();
 
-    ReaderParent.init();
-
     SelfSupportBackend.init();
 
     if (AppConstants.INSTALL_COMPACT_THEMES) {
       let vendorShortName = gBrandBundle.GetStringFromName("vendorShortName");
 
       LightweightThemeManager.addBuiltInTheme({
         id: "firefox-compact-light@mozilla.org",
         name: gBrowserBundle.GetStringFromName("compactLightTheme.name"),

--- a/browser/modules/ReaderParent.jsm
+++ b/browser/modules/ReaderParent.jsm
@@ -15,29 +15,17 @@ Cu.import("resource://gre/modules/Task.j
 
 XPCOMUtils.defineLazyModuleGetter(this, "PlacesUtils", "resource://gre/modules/PlacesUtils.jsm");
 XPCOMUtils.defineLazyModuleGetter(this, "ReaderMode", "resource://gre/modules/ReaderMode.jsm");
 XPCOMUtils.defineLazyModuleGetter(this, "UITour", "resource:///modules/UITour.jsm");
 
 const gStringBundle = Services.strings.createBundle("chrome://global/locale/aboutReader.properties");
 
 var ReaderParent = {
-  MESSAGES: [
-    "Reader:ArticleGet",
-    "Reader:FaviconRequest",
-    "Reader:UpdateReaderButton",
-  ],
-
-  init() {
-    let mm = Cc["@mozilla.org/globalmessagemanager;1"].getService(Ci.nsIMessageListenerManager);
-    for (let msg of this.MESSAGES) {
-      mm.addMessageListener(msg, this);
-    }
-  },
-
+  // Listeners are added in nsBrowserGlue.js
   receiveMessage(message) {
     switch (message.name) {
       case "Reader:ArticleGet":
         this._getArticle(message.data.url, message.target).then((article) => {
           // Make sure the target browser is still alive before trying to send data back.
           if (message.target.messageManager) {
             message.target.messageManager.sendAsyncMessage("Reader:ArticleData", { article });
           }