--- a/browser/extensions/pdfjs/content/PdfjsChromeUtils.jsm
+++ b/browser/extensions/pdfjs/content/PdfjsChromeUtils.jsm
@@ -385,17 +385,17 @@ var PdfjsChromeUtils = {
           sendMessage(true);
         },
       },
     ];
     notificationBox.appendNotification(
       data.message,
       "pdfjs-fallback",
       null,
-      notificationBox.PRIORITY_INFO_LOW,
+      notificationBox.PRIORITY_WARNING_LOW,
       buttons,
       function eventsCallback(eventType) {
         // Currently there is only one event "removed" but if there are any other
         // added in the future we still only care about removed at the moment.
         if (eventType !== "removed") {
           return;
         }
         // Don't send a response again if we already responded when the button was