diff --git a/browser/base/content/aboutDialog.js b/browser/base/content/aboutDialog.js
index a33c53e80a5..aa37529ed6c 100644
--- a/browser/base/content/aboutDialog.js
+++ b/browser/base/content/aboutDialog.js
@@ -302,6 +302,15 @@ appUpdater.prototype =
         return;
       }
 
+      if (gAppUpdater.update.unsupported) {
+        if (gAppUpdater.update.detailsURL) {
+          let unsupportedLink = document.getElementById("unsupportedLink");
+          unsupportedLink.href = gAppUpdater.update.detailsURL;
+        }
+        gAppUpdater.selectPanel("unsupportedSystem");
+        return;
+      }
+
       if (!gAppUpdater.aus.canApplyUpdates) {
         gAppUpdater.selectPanel("manualUpdate");
         return;
diff --git a/browser/base/content/aboutDialog.xul b/browser/base/content/aboutDialog.xul
index 3d88664dddc..d56de32f85f 100644
--- a/browser/base/content/aboutDialog.xul
+++ b/browser/base/content/aboutDialog.xul
@@ -82,6 +82,9 @@
               <hbox id="manualUpdate" align="center">
                 <label>&update.manual.start;</label><label id="manualLink" class="text-link"/><label>&update.manual.end;</label>
               </hbox>
+              <hbox id="unsupportedSystem" align="center">
+                <label>&update.unsupported.start;</label><label id="unsupportedLink" class="text-link">&update.unsupported.linkText;</label><label>&update.unsupported.end;</label>
+              </hbox>
             </deck>
 #endif
           </vbox>
diff --git a/browser/locales/en-US/chrome/browser/aboutDialog.dtd b/browser/locales/en-US/chrome/browser/aboutDialog.dtd
index a901ebca15d..b592ad101fb 100644
--- a/browser/locales/en-US/chrome/browser/aboutDialog.dtd
+++ b/browser/locales/en-US/chrome/browser/aboutDialog.dtd
@@ -66,6 +66,16 @@
 <!ENTITY update.manual.start        "Updates available at ">
 <!ENTITY update.manual.end          "">
 
+<!-- LOCALIZATION NOTE (update.unsupported.start,update.unsupported.linkText,update.unsupported.end):
+     update.unsupported.start, update.unsupported.linkText, and
+     update.unsupported.end all go into one line with linkText being wrapped in
+     an anchor that links to a site to provide additional information regarding
+     why the system is no longer supported. As this is all in one line, try to
+     make the localized text short (see bug 843497 for screenshots). -->
+<!ENTITY update.unsupported.start    "You can not perform further updates on this system. ">
+<!ENTITY update.unsupported.linkText "Learn more">
+<!ENTITY update.unsupported.end      "">
+
 <!-- LOCALIZATION NOTE (update.downloading.start,update.downloading.end): update.downloading.start and 
      update.downloading.end all go into one line, with the amount downloaded inserted in between. As this
      is all in one line, try to make the localized text short (see bug 596813 for screenshots). The — is