--- a/browser/base/content/browser-media.js
+++ b/browser/base/content/browser-media.js
@@ -1,13 +1,15 @@
 /* -*- indent-tabs-mode: nil; js-indent-level: 2 -*-
  * This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
+"use strict";
+
 var gEMEHandler = {
   get uiEnabled() {
     let emeUIEnabled = Services.prefs.getBoolPref("browser.eme.ui.enabled");
     // Force-disable on WinXP:
     if (navigator.platform.toLowerCase().startsWith("win")) {
       emeUIEnabled = emeUIEnabled && parseFloat(Services.sysinfo.get("version")) >= 6;
     }
     return emeUIEnabled;
@@ -204,19 +206,16 @@ let gDecoderDoctorHandler = {
       if (AppConstants.isPlatformAndVersionAtMost("win", "5.9")) {
         // We supply our own Learn More button so we don't need to populate the message here.
         return gNavigatorBundle.getFormattedString("emeNotifications.drmContentDisabled.message", [""]);
       }
       return gNavigatorBundle.getString("decoder.noCodecs.message");
     }
     if (type == "adobe-cdm-not-activated" &&
         AppConstants.platform == "win") {
-      if (AppConstants.isPlatformAndVersionAtMost("win", "5.9")) {
-        return gNavigatorBundle.getString("decoder.noCodecsXP.message");
-      }
       if (!AppConstants.isPlatformAndVersionAtLeast("win", "6.1")) {
         return gNavigatorBundle.getString("decoder.noCodecsVista.message");
       }
       return gNavigatorBundle.getString("decoder.noCodecs.message");
     }
     if (type == "platform-decoder-not-found") {
       if (AppConstants.isPlatformAndVersionAtLeast("win", "6.1")) {
         return gNavigatorBundle.getString("decoder.noHWAcceleration.message");

--- a/browser/base/content/test/general/browser_decoderDoctor.js
+++ b/browser/base/content/test/general/browser_decoderDoctor.js
@@ -63,32 +63,21 @@ add_task(function* test_adobe_cdm_not_fo
 });
 
 add_task(function* test_adobe_cdm_not_activated() {
   // This is only sent on Windows.
   if (AppConstants.platform != "win") {
     return;
   }
 
-  let message;
-  if (AppConstants.isPlatformAndVersionAtMost("win", "5.9")) {
-    message = gNavigatorBundle.getString("decoder.noCodecsXP.message");
-  } else {
-    message = gNavigatorBundle.getString("decoder.noCodecs.message");
-  }
-
+  let message = gNavigatorBundle.getString("decoder.noCodecs.message");
   yield test_decoder_doctor_notification("adobe-cdm-not-activated", message);
 });
 
 add_task(function* test_platform_decoder_not_found() {
-  // Not sent on Windows XP.
-  if (AppConstants.isPlatformAndVersionAtMost("win", "5.9")) {
-    return;
-  }
-
   let message;
   let isLinux = AppConstants.platform == "linux";
   if (isLinux) {
     message = gNavigatorBundle.getString("decoder.noCodecsLinux.message");
   } else {
     message = gNavigatorBundle.getString("decoder.noHWAcceleration.message");
   }
 

--- a/browser/locales/en-US/chrome/browser/browser.properties
+++ b/browser/locales/en-US/chrome/browser/browser.properties
@@ -724,17 +724,16 @@ pendingCrashReports2.label = You have an
 pendingCrashReports.viewAll = View
 pendingCrashReports.send = Send
 pendingCrashReports.alwaysSend = Always Send
 
 decoder.noCodecs.button = Learn how
 decoder.noCodecs.accesskey = L
 decoder.noCodecs.message = To play video, you may need to install Microsoft’s Media Feature Pack.
 decoder.noCodecsVista.message = To play video, you may need to install Microsoft’s Platform Update Supplement for Windows Vista.
-decoder.noCodecsXP.message = To play video, you may need to enable Adobe’s Primetime Content Decryption Module.
 decoder.noCodecsLinux.message = To play video, you may need to install the required video codecs.
 decoder.noHWAcceleration.message = To improve video quality, you may need to install Microsoft’s Media Feature Pack.
 decoder.noHWAccelerationVista.message = To improve video quality, you may need to install Microsoft’s Platform Update Supplement for Windows Vista.
 decoder.noPulseAudio.message = To play audio, you may need to install the required PulseAudio software.
 decoder.unsupportedLibavcodec.message = libavcodec may be vulnerable or is not supported, and should be updated to play video.
 
 # LOCALIZATION NOTE (captivePortal.infoMessage2):
 # Shown in a notification bar when we detect a captive portal is blocking network access