--- a/mobile/chrome/content/extensions.js
+++ b/mobile/chrome/content/extensions.js
@@ -711,17 +711,17 @@ XPInstallDownloadManager.prototype = {
     ExtensionsView.installFromXPI(items, aManager);
 
     if (ExtensionsView.visible)
       return;
 
     let strings = document.getElementById("bundle_browser");
     var alerts = Cc["@mozilla.org/alerts-service;1"].getService(Ci.nsIAlertsService);
     alerts.showAlertNotification(URI_GENERIC_ICON_XPINSTALL, strings.getString("alertAddons"),
-                                 strings.getString("alertAddonsStart"), false, "", null);
+                                 strings.getString("alertAddonsInstalling"), false, "", null);
   },
 
   /////////////////////////////////////////////////////////////////////////////
   // nsIAddonInstallListener
   onDownloadStarted: function(aAddon) { },
   onDownloadEnded: function(aAddon) { },
   onInstallStarted: function(aAddon) { },
   onCompatibilityCheckStarted: function(aAddon) { },

--- a/mobile/locales/en-US/chrome/browser.properties
+++ b/mobile/locales/en-US/chrome/browser.properties
@@ -34,17 +34,17 @@ downloadsUnknownSize=Unknown size
 # LOCALIZATION NOTE (KnownSize): #1 size number; #2 size unit
 downloadsKnownSize=#1 #2
 donwloadsYesterday=Yesterday
 # LOCALIZATION NOTE (MonthDate): #1 month name; #2 date number; e.g., January 22
 downloadsMonthDate=#1 #2
 
 # Alerts
 alertAddons=Add-ons
-alertAddonsStart=Installing addons
+alertAddonsInstalling=Installing add-on
 alertAddonsDone=Installation complete
 alertAddonsFail=Installation failed
 
 # LOCALIZATION NOTE (alertAddonsDisabled): Semi-colon list of plural forms.
 # See: http://developer.mozilla.org/en/docs/Localization_and_Plurals
 # #1 number of add-ons
 alertAddonsDisabled=#1 incompatible add-on was disabled;#1 incompatible add-ons were disabled