--- a/browser/base/content/browser-ctrlTab.js
+++ b/browser/base/content/browser-ctrlTab.js
@@ -465,17 +465,17 @@ var ctrlTab = {
       setTimeout(function (selected) {
         selected.focus();
       }, 0, this.selected);
     }
   },
 
   handleEvent: function ctrlTab_handleEvent(event) {
     switch (event.type) {
-      case "SSWindowStateReady":
+      case "SSWindowRestored":
         this._initRecentlyUsedTabs();
         break;
       case "TabAttrModified":
         // tab attribute modified (e.g. label, crop, busy, image, selected)
         for (let i = this.previews.length - 1; i >= 0; i--) {
           if (this.previews[i]._tab && this.previews[i]._tab == event.target) {
             this.updatePreview(this.previews[i], event.target);
             break;
@@ -526,17 +526,17 @@ var ctrlTab = {
     this._recentlyUsedTabs =
       Array.filter(gBrowser.tabs, tab => !tab.closing)
            .sort((tab1, tab2) => tab2.lastAccessed - tab1.lastAccessed);
   },
 
   _init: function ctrlTab__init(enable) {
     var toggleEventListener = enable ? "addEventListener" : "removeEventListener";
 
-    window[toggleEventListener]("SSWindowStateReady", this, false);
+    window[toggleEventListener]("SSWindowRestored", this, false);
 
     var tabContainer = gBrowser.tabContainer;
     tabContainer[toggleEventListener]("TabOpen", this, false);
     tabContainer[toggleEventListener]("TabAttrModified", this, false);
     tabContainer[toggleEventListener]("TabSelect", this, false);
     tabContainer[toggleEventListener]("TabClose", this, false);
 
     document[toggleEventListener]("keypress", this, false);

--- a/browser/components/sessionstore/SessionStore.jsm
+++ b/browser/components/sessionstore/SessionStore.jsm
@@ -3068,16 +3068,18 @@ var SessionStoreInternal = {
 
     // set smoothScroll back to the original value
     tabstrip.smoothScroll = smoothScroll;
 
     TelemetryStopwatch.finish("FX_SESSION_RESTORE_RESTORE_WINDOW_MS");
 
     this._setWindowStateReady(aWindow);
 
+    this._sendWindowRestoredNotification(aWindow);
+
     Services.obs.notifyObservers(aWindow, NOTIFY_SINGLE_WINDOW_RESTORED, "");
 
     this._sendRestoreCompletedNotifications();
   },
 
   /**
    * Restore multiple windows using the provided state.
    * @param aWindow
@@ -4059,16 +4061,27 @@ var SessionStoreInternal = {
    */
   _sendWindowStateEvent: function ssi_sendWindowStateEvent(aWindow, aType) {
     let event = aWindow.document.createEvent("Events");
     event.initEvent("SSWindowState" + aType, true, false);
     aWindow.dispatchEvent(event);
   },
 
   /**
+   * Dispatch the SSWindowRestored event for the given window.
+   * @param aWindow
+   *        The window which has been restored
+   */
+  _sendWindowRestoredNotification(aWindow) {
+    let event = aWindow.document.createEvent("Events");
+    event.initEvent("SSWindowRestored", true, false);
+    aWindow.dispatchEvent(event);
+  },
+
+  /**
    * Dispatch the SSTabRestored event for the given tab.
    * @param aTab
    *        The tab which has been restored
    * @param aIsRemotenessUpdate
    *        True if this tab was restored due to flip from running from
    *        out-of-main-process to in-main-process or vice-versa.
    */
   _sendTabRestoredNotification(aTab, aIsRemotenessUpdate) {