--- a/browser/base/content/browser.js
+++ b/browser/base/content/browser.js
@@ -2566,26 +2566,24 @@ let gMenuButtonUpdateBadge = {
     if (this.enabled) {
       try {
         this.badgeWaitTime = Services.prefs.getIntPref("app.update.badgeWaitTime");
       } catch (e) {
         this.badgeWaitTime = 345600; // 4 days
       }
       PanelUI.menuButton.classList.add("badged-button");
       Services.obs.addObserver(this, "update-staged", false);
-      Services.obs.addObserver(this, "update-downloaded", false);
     }
   },
 
   uninit: function () {
     if (this.timer)
       this.timer.cancel();
     if (this.enabled) {
       Services.obs.removeObserver(this, "update-staged");
-      Services.obs.removeObserver(this, "update-downloaded");
       PanelUI.panel.removeEventListener("popupshowing", this, true);
       this.enabled = false;
     }
   },
 
   onMenuPanelCommand: function(event) {
     if (event.originalTarget.getAttribute("update-status") === "succeeded") {
       // restart the app
@@ -2599,65 +2597,82 @@ let gMenuButtonUpdateBadge = {
     } else {
       // open the page for manual update
       let url = Services.urlFormatter.formatURLPref("app.update.url.manual");
       openUILinkIn(url, "tab");
     }
   },
 
   observe: function (subject, topic, status) {
-    if (status == "failed") {
-      // Background update has failed, let's show the UI responsible for
-      // prompting the user to update manually.
-      this.displayBadge(false);
-      this.uninit();
-      return;
-    }
-
-    // Give the user badgeWaitTime seconds to react before prompting.
-    this.timer = Cc["@mozilla.org/timer;1"].createInstance(Ci.nsITimer);
-    this.timer.initWithCallback(this, this.badgeWaitTime * 1000,
-                                this.timer.TYPE_ONE_SHOT);
-    // The timer callback will call uninit() when it completes.
+    const STATE_DOWNLOADING     = "downloading";
+    const STATE_PENDING         = "pending";
+    const STATE_PENDING_SVC     = "pending-service";
+    const STATE_APPLIED         = "applied";
+    const STATE_APPLIED_SVC     = "applied-service";
+    const STATE_FAILED          = "failed";
+
+    let updateButton = document.getElementById("PanelUI-update-status");
+
+    let updateButtonText;
+    let stringId;
+
+    // Update the UI when the background updater is finished.
+    switch (status) {
+      case STATE_APPLIED:
+      case STATE_APPLIED_SVC:
+      case STATE_PENDING:
+      case STATE_PENDING_SVC:
+        if (this.timer) {
+          return;
+        }
+        // Give the user badgeWaitTime seconds to react before prompting.
+        this.timer = Cc["@mozilla.org/timer;1"].createInstance(Ci.nsITimer);
+        this.timer.initWithCallback(this, this.badgeWaitTime * 1000,
+                                    this.timer.TYPE_ONE_SHOT);
+        // The timer callback will call uninit() when it completes.
+        break;
+      case STATE_FAILED:
+        // Background update has failed, let's show the UI responsible for
+        // prompting the user to update manually.
+        PanelUI.menuButton.setAttribute("update-status", "failed");
+        PanelUI.menuButton.setAttribute("badge", "!");
+
+        stringId = "appmenu.updateFailed.description";
+        updateButtonText = gNavigatorBundle.getString(stringId);
+
+        updateButton.setAttribute("label", updateButtonText);
+        updateButton.setAttribute("update-status", "failed");
+        updateButton.hidden = false;
+
+        PanelUI.panel.addEventListener("popupshowing", this, true);
+
+        this.uninit();
+        break;
+    }
   },
 
   notify: function () {
     // If the update is successfully applied, or if the updater has fallen back
     // to non-staged updates, add a badge to the hamburger menu to indicate an
     // update will be applied once the browser restarts.
-    this.displayBadge(true);
-    this.uninit();
-  },
-
-  displayBadge: function (succeeded) {
-    let status = succeeded ? "succeeded" : "failed";
-    PanelUI.menuButton.setAttribute("update-status", status);
-    if (!succeeded) {
-      PanelUI.menuButton.setAttribute("badge", "!");
-    }
-
-    let stringId;
-    let updateButtonText;
-    if (succeeded) {
-      let brandBundle = document.getElementById("bundle_brand");
-      let brandShortName = brandBundle.getString("brandShortName");
-      stringId = "appmenu.restartNeeded.description";
-      updateButtonText = gNavigatorBundle.getFormattedString(stringId,
-                                                             [brandShortName]);
-    } else {
-      stringId = "appmenu.updateFailed.description";
-      updateButtonText = gNavigatorBundle.getString(stringId);
-    }
+    PanelUI.menuButton.setAttribute("update-status", "succeeded");
+
+    let brandBundle = document.getElementById("bundle_brand");
+    let brandShortName = brandBundle.getString("brandShortName");
+    stringId = "appmenu.restartNeeded.description";
+    updateButtonText = gNavigatorBundle.getFormattedString(stringId,
+                                                           [brandShortName]);
 
     let updateButton = document.getElementById("PanelUI-update-status");
     updateButton.setAttribute("label", updateButtonText);
-    updateButton.setAttribute("update-status", status);
+    updateButton.setAttribute("update-status", "succeeded");
     updateButton.hidden = false;
 
     PanelUI.panel.addEventListener("popupshowing", this, true);
+    this.uninit();
   },
 
   handleEvent: function(e) {
     if (e.type === "popupshowing") {
       PanelUI.menuButton.removeAttribute("badge");
       PanelUI.panel.removeEventListener("popupshowing", this, true);
     }
   }

--- a/toolkit/mozapps/update/nsUpdateService.js
+++ b/toolkit/mozapps/update/nsUpdateService.js
@@ -4563,26 +4563,23 @@ UpdatePrompt.prototype = {
                            UPDATE_WINDOW_NAME, "updatesavailable", update,
                            title, text, imageUrl);
   },
 
   /**
    * See nsIUpdateService.idl
    */
   showUpdateDownloaded: function UP_showUpdateDownloaded(update, background) {
-    if (background && getPref("getBoolPref", PREF_APP_UPDATE_SILENT, false))
-      return;
-    }
-    // Trigger the display of the hamburger menu badge.
-    Services.obs.notifyObservers(null, "update-downloaded", update.state);
-
     if (this._getAltUpdateWindow())
       return;
 
     if (background) {
+      if (getPref("getBoolPref", PREF_APP_UPDATE_SILENT, false))
+        return;
+
       var stringsPrefix = "updateDownloaded_" + update.type + ".";
       var title = gUpdateBundle.formatStringFromName(stringsPrefix + "title",
                                                      [update.name], 1);
       var text = gUpdateBundle.GetStringFromName(stringsPrefix + "text");
       var imageUrl = "";
       this._showUnobtrusiveUI(null, URI_UPDATE_PROMPT_DIALOG, null,
                               UPDATE_WINDOW_NAME, "finishedBackground", update,
                               title, text, imageUrl);