diff --git a/application/palemoon/base/content/baseMenuOverlay.xul b/application/palemoon/base/content/baseMenuOverlay.xul
index e9019dc55c..d7c9836711 100644
--- a/application/palemoon/base/content/baseMenuOverlay.xul
+++ b/application/palemoon/base/content/baseMenuOverlay.xul
@@ -41,7 +41,7 @@
           label="&helpMenu.label;"
           accesskey="&helpMenu.accesskey;">
 #endif
-      <menupopup id="menu_HelpPopup">
+      <menupopup id="menu_HelpPopup" onpopupshowing="buildHelpMenu();">
         <menuitem id="menu_openHelp"
                   oncommand="openHelpLink('firefox-help')"
                   onclick="checkForMiddleClick(this, event);"
@@ -66,6 +66,14 @@
                   accesskey="&helpSafeMode.accesskey;"
                   label="&helpSafeMode.label;"
                   oncommand="restart(true);"/>
+        <menuseparator id="updateSeparator"/>
+        <menuitem id="checkForUpdates" class="menuitem-iconic"
+#ifdef MOZ_UPDATER
+                  label="&updateCmd.label;"
+                  oncommand="checkForUpdates();"/>
+#else
+                  hidden="true"/>
+#endif
         <menuseparator id="aboutSeparator"/>
         <menuitem id="aboutName"
                   accesskey="&aboutProduct.accesskey;"
diff --git a/application/palemoon/base/content/browser-appmenu.inc b/application/palemoon/base/content/browser-appmenu.inc
index cfc855484a..ffb117a605 100644
--- a/application/palemoon/base/content/browser-appmenu.inc
+++ b/application/palemoon/base/content/browser-appmenu.inc
@@ -341,7 +341,7 @@
       <splitmenu id="appmenu_help"
                  label="&helpMenu.label;"
                  oncommand="openHelpLink('firefox-help')">
-          <menupopup id="appmenu_helpMenupopup">
+          <menupopup id="appmenu_helpMenupopup" onpopupshowing="buildHelpMenu();">
             <menuitem id="appmenu_openHelp"
                       label="&helpMenu.label;"
                       oncommand="openHelpLink('firefox-help')"
@@ -358,6 +358,13 @@
             <menuitem id="appmenu_safeMode"
                       label="&appMenuSafeMode.label;"
                       oncommand="restart(true);"/>
+#ifdef MOZ_UPDATER
+            <menuseparator/>
+            <menuitem id="appmenu_checkForUpdates"
+                      class="menuitem-iconic"
+                      label="&updateCmd.label;"
+                      oncommand="checkForUpdates();"/>
+#endif
             <menuseparator/>
             <menuitem id="appmenu_about"
                       label="&aboutProduct.label;"
diff --git a/application/palemoon/base/content/utilityOverlay.js b/application/palemoon/base/content/utilityOverlay.js
index 2c1a95f83c..fe148ad04a 100644
--- a/application/palemoon/base/content/utilityOverlay.js
+++ b/application/palemoon/base/content/utilityOverlay.js
@@ -541,6 +541,117 @@ function isBidiEnabled() {
   return rv;
 }
 
+#ifdef MOZ_UPDATER
+/**
+ * Opens the update manager and checks for updates to the application.
+ */
+function checkForUpdates()
+{
+  var um =
+      Components.classes["@mozilla.org/updates/update-manager;1"].
+      getService(Components.interfaces.nsIUpdateManager);
+  var prompter =
+      Components.classes["@mozilla.org/updates/update-prompt;1"].
+      createInstance(Components.interfaces.nsIUpdatePrompt);
+
+  // If there's an update ready to be applied, show the "Update Downloaded"
+  // UI instead and let the user know they have to restart the application for
+  // the changes to be applied.
+  if (um.activeUpdate && um.activeUpdate.state == "pending")
+    prompter.showUpdateDownloaded(um.activeUpdate);
+  else
+    prompter.checkForUpdates();
+}
+#endif
+
+/**
+ * Set up the help menu software update items to show proper status,
+ * also disabling the items if update is disabled.
+ */
+function buildHelpMenu()
+{
+#ifdef MOZ_UPDATER
+  var updates =
+      Components.classes["@mozilla.org/updates/update-service;1"].
+      getService(Components.interfaces.nsIApplicationUpdateService);
+  var um =
+      Components.classes["@mozilla.org/updates/update-manager;1"].
+      getService(Components.interfaces.nsIUpdateManager);
+
+  // Disable the UI if the update enabled pref has been locked by the
+  // administrator or if we cannot update for some other reason.
+  var checkForUpdates = document.getElementById("checkForUpdates");
+  var appMenuCheckForUpdates = document.getElementById("appmenu_checkForUpdates");
+  var canCheckForUpdates = updates.canCheckForUpdates;
+  checkForUpdates.setAttribute("disabled", !canCheckForUpdates);
+  appMenuCheckForUpdates.setAttribute("disabled", !canCheckForUpdates);
+  if (!canCheckForUpdates)
+    return;
+
+  var strings = document.getElementById("bundle_browser");
+  var activeUpdate = um.activeUpdate;
+
+  // If there's an active update, substitute its name into the label
+  // we show for this item, otherwise display a generic label.
+  function getStringWithUpdateName(key) {
+    if (activeUpdate && activeUpdate.name)
+      return strings.getFormattedString(key, [activeUpdate.name]);
+    return strings.getString(key + "Fallback");
+  }
+
+  // By default, show "Check for Updates..." from updatesItem_default or
+  // updatesItem_defaultFallback
+  var key = "default";
+  if (activeUpdate) {
+    switch (activeUpdate.state) {
+    case "downloading":
+      // If we're downloading an update at present, show the text:
+      // "Downloading Thunderbird x.x..." from updatesItem_downloading or
+      // updatesItem_downloadingFallback, otherwise we're paused, and show
+      // "Resume Downloading Thunderbird x.x..." from updatesItem_resume or
+      // updatesItem_resumeFallback
+      key = updates.isDownloading ? "downloading" : "resume";
+      break;
+    case "pending":
+      // If we're waiting for the user to restart, show: "Apply Downloaded
+      // Updates Now..." from updatesItem_pending or
+      // updatesItem_pendingFallback
+      key = "pending";
+      break;
+    }
+  }
+
+  checkForUpdates.label = getStringWithUpdateName("updatesItem_" + key);
+  appMenuCheckForUpdates.label = getStringWithUpdateName("updatesItem_" + key);
+  // updatesItem_default.accesskey, updatesItem_downloading.accesskey,
+  // updatesItem_resume.accesskey or updatesItem_pending.accesskey
+  checkForUpdates.accessKey = strings.getString("updatesItem_" + key +
+                                                ".accesskey");
+  appMenuCheckForUpdates.accessKey = strings.getString("updatesItem_" + key +
+                                                       ".accesskey");
+  if (um.activeUpdate && updates.isDownloading) {
+    checkForUpdates.setAttribute("loading", "true");
+    appMenuCheckForUpdates.setAttribute("loading", "true");  
+  } else {
+    checkForUpdates.removeAttribute("loading");
+    appMenuCheckForUpdates.removeAttribute("loading");
+  }
+#else
+#ifndef XP_MACOSX
+  // Some extensions may rely on these being present so only hide the about
+  // separator when there are no elements besides the check for updates menuitem
+  // in between the about separator and the updates separator.
+  var updatesSeparator = document.getElementById("updatesSeparator");
+  var aboutSeparator = document.getElementById("aboutSeparator");
+  var checkForUpdates = document.getElementById("checkForUpdates");
+  if (updatesSeparator.nextSibling === checkForUpdates &&
+      checkForUpdates.nextSibling === aboutSeparator)
+    updatesSeparator.hidden = true;
+#endif
+#endif
+}
+
+
 function openAboutDialog() {
   var enumerator = Services.wm.getEnumerator("Browser:About");
   while (enumerator.hasMoreElements()) {
diff --git a/application/palemoon/locales/en-US/chrome/browser/baseMenuOverlay.dtd b/application/palemoon/locales/en-US/chrome/browser/baseMenuOverlay.dtd
index a926b0ed24..27de3797f3 100644
--- a/application/palemoon/locales/en-US/chrome/browser/baseMenuOverlay.dtd
+++ b/application/palemoon/locales/en-US/chrome/browser/baseMenuOverlay.dtd
@@ -14,6 +14,7 @@
                        for the help button in the menubar but Gnome does not.   -->
 <!ENTITY helpMenuWin.label        "Help"> 
 <!ENTITY helpMenuWin.accesskey    "H">
+<!ENTITY updateCmd.label          "Check for Updates…">
 <!ENTITY aboutProduct.label       "About &brandShortName;">
 <!ENTITY aboutProduct.accesskey   "A">
 <!ENTITY productHelp.label        "&brandShortName; Help">
diff --git a/application/palemoon/locales/en-US/chrome/browser/browser.properties b/application/palemoon/locales/en-US/chrome/browser/browser.properties
index dbe6dbaa1a..0144af0c79 100644
--- a/application/palemoon/locales/en-US/chrome/browser/browser.properties
+++ b/application/palemoon/locales/en-US/chrome/browser/browser.properties
@@ -201,6 +201,22 @@ update.openUpdateUI.upgradeButton.accesskey=U
 update.restart.upgradeButton.label=Upgrade Now
 update.restart.upgradeButton.accesskey=U
 
+# Check for Updates in the Help Menu
+# LOCALIZATION NOTE (updatesItem_*): these are alternative labels for Check for Update item in Help menu.
+# Which one is used depends on Update process state.
+updatesItem_default=Check for Updates…
+updatesItem_defaultFallback=Check for Updates…
+updatesItem_default.accesskey=C
+updatesItem_downloading=Downloading %S…
+updatesItem_downloadingFallback=Downloading Update…
+updatesItem_downloading.accesskey=D
+updatesItem_resume=Resume Downloading %S…
+updatesItem_resumeFallback=Resume Downloading Update…
+updatesItem_resume.accesskey=D
+updatesItem_pending=Apply Downloaded Update Now…
+updatesItem_pendingFallback=Apply Downloaded Update Now…
+updatesItem_pending.accesskey=D
+
 # RSS Pretty Print
 feedShowFeedNew=Subscribe to '%S'…