--- a/browser/base/content/browser-eme.js
+++ b/browser/base/content/browser-eme.js
@@ -18,16 +18,20 @@ var gEMEHandler = {
       if (keySystem.startsWith("com.adobe") &&
           Services.prefs.getPrefType("media.gmp-eme-adobe.enabled") &&
           !Services.prefs.getBoolPref("media.gmp-eme-adobe.enabled")) {
         Services.prefs.setBoolPref("media.gmp-eme-adobe.enabled", true);
       } else if (keySystem == "org.w3.clearkey" &&
                  Services.prefs.getPrefType("media.eme.clearkey.enabled") &&
                  !Services.prefs.getBoolPref("media.eme.clearkey.enabled")) {
         Services.prefs.setBoolPref("media.eme.clearkey.enabled", true);
+      } else if (keySystem == "com.widevine.alpha" &&
+                 Services.prefs.getPrefType("media.gmp-widevinecdm.enabled") &&
+                 !Services.prefs.getBoolPref("media.gmp-widevinecdm.enabled")) {
+        Services.prefs.setBoolPref("media.gmp-widevinecdm.enabled", true);
       }
     }
     browser.reload();
   },
   getLearnMoreLink: function(msgId) {
     let text = gNavigatorBundle.getString("emeNotifications." + msgId + ".learnMoreLabel");
     let baseURL = Services.urlFormatter.formatURLPref("app.support.baseURL");
     return "<label class='text-link' href='" + baseURL + "drm-content'>" +