diff --git a/public/js/vroom.js b/public/js/vroom.js
index 19b0f98..5142a18 100644
--- a/public/js/vroom.js
+++ b/public/js/vroom.js
@@ -2009,7 +2009,7 @@ function initVroom(room) {
           // This error usually means you have denied access (old flag way)
           // or you cancelled screen sharing (new extension way)
           // or you select no window (in Firefox)
-          else if ((err.name === 'PermissionDeniedError' || err.name === 'SecurityError') && $.browser.mozilla){
+          else if ((err.name === 'PermissionDeniedError' || err.name === 'SecurityError' || err.name === 'NotAllowedError') && $.browser.mozilla){
             $('#firefoxShareScreenModal').modal('show');
           }
           else if (err.name === 'PERMISSION_DENIED' ||