--- a/browser/components/nsBrowserGlue.js
+++ b/browser/components/nsBrowserGlue.js
@@ -2237,17 +2237,17 @@ let DefaultBrowserCheck = {
         accessKey: optionsKey,
         popup: this.OPTIONPOPUP
       }
     ];
 
 
     let iconPixels = win.devicePixelRatio > 1 ? "32" : "16";
     let iconURL = "chrome://branding/content/icon" + iconPixels + ".png";
-    const priority = notificationBox.PRIORITY_INFO_HIGH;
+    const priority = notificationBox.PRIORITY_WARNING_HIGH;
     let callback = this._onNotificationEvent.bind(this);
     this._notification = notificationBox.appendNotification(promptMessage, "default-browser",
                                                             iconURL, priority, buttons,
                                                             callback);
     this._notification.persistence = -1;
   },
 
   _onNotificationEvent: function(eventType) {