--- a/browser/base/content/browser-addons.js
+++ b/browser/base/content/browser-addons.js
@@ -420,45 +420,52 @@ const gXPInstallObserver = {
       }
       showNotification();
       break; }
     case "addon-install-complete": {
       let needsRestart = installInfo.installs.some(function(i) {
         return i.addon.pendingOperations != AddonManager.PENDING_NONE;
       });
 
+      let secondaryActions = null;
+
       if (needsRestart) {
         notificationID = "addon-install-restart";
         messageString = gNavigatorBundle.getString("addonsInstalledNeedsRestart");
         action = {
           label: gNavigatorBundle.getString("addonInstallRestartButton"),
           accessKey: gNavigatorBundle.getString("addonInstallRestartButton.accesskey"),
           callback: function() {
             BrowserUtils.restartApplication();
           }
         };
+        secondaryActions = [{
+          label: gNavigatorBundle.getString("addonInstallRestartIgnoreButton"),
+          accessKey: gNavigatorBundle.getString("addonInstallRestartIgnoreButton.accesskey"),
+          callback: () => {},
+        }];
       }
       else {
         messageString = gNavigatorBundle.getString("addonsInstalled");
         action = null;
       }
 
       messageString = PluralForm.get(installInfo.installs.length, messageString);
       messageString = messageString.replace("#1", installInfo.installs[0].name);
       messageString = messageString.replace("#2", installInfo.installs.length);
       messageString = messageString.replace("#3", brandShortName);
 
-      // Remove notificaion on dismissal, since it's possible to cancel the
+      // Remove notification on dismissal, since it's possible to cancel the
       // install through the addons manager UI, making the "restart" prompt
       // irrelevant.
       options.removeOnDismissal = true;
       options.persistent = false;
 
       PopupNotifications.show(browser, notificationID, messageString, anchorID,
-                              action, null, options);
+                              action, secondaryActions, options);
       break; }
     }
   },
   _removeProgressNotification(aBrowser) {
     let notification = PopupNotifications.getNotification("addon-progress", aBrowser);
     if (notification)
       notification.remove();
   }

--- a/browser/locales/en-US/chrome/browser/browser.properties
+++ b/browser/locales/en-US/chrome/browser/browser.properties
@@ -72,16 +72,18 @@ addonwatch.restart.accesskey=R
 # LOCALIZATION NOTE (addonsInstalled, addonsInstalledNeedsRestart):
 # Semicolon-separated list of plural forms. See:
 # http://developer.mozilla.org/en/docs/Localization_and_Plurals
 # #1 first add-on's name, #2 number of add-ons, #3 application name
 addonsInstalled=#1 has been installed successfully.;#2 add-ons have been installed successfully.
 addonsInstalledNeedsRestart=#1 will be installed after you restart #3.;#2 add-ons will be installed after you restart #3.
 addonInstallRestartButton=Restart Now
 addonInstallRestartButton.accesskey=R
+addonInstallRestartIgnoreButton=Not Now
+addonInstallRestartIgnoreButton.accesskey=N
 
 # LOCALIZATION NOTE (addonInstallError-1, addonInstallError-2, addonInstallError-3, addonInstallError-4, addonInstallError-5, addonLocalInstallError-1, addonLocalInstallError-2, addonLocalInstallError-3, addonLocalInstallError-4, addonLocalInstallError-5):
 # %1$S is the application name, %2$S is the add-on name
 addonInstallError-1=The add-on could not be downloaded because of a connection failure.
 addonInstallError-2=The add-on could not be installed because it does not match the add-on %1$S expected.
 addonInstallError-3=The add-on downloaded from this site could not be installed because it appears to be corrupt.
 addonInstallError-4=%2$S could not be installed because %1$S cannot modify the needed file.
 addonInstallError-5=%1$S has prevented this site from installing an unverified add-on.