I am getting error when i try to embed Facebook page using Facebook Page Plugin
https://developers.facebook.com/docs/plugins/page-plugin/
DO i need to select App ID or its optional, as it doesnt work for me i have created different App ID but it doesnt work with one or the other page which i try to embeb. I have tried same on different browser but Embed code doesnt show on page on FF browser i get following error
Firefox Can’t Open This Page To protect your security, www.facebook.com will not allow Firefox to display the page if another site has embedded it. To see this page, you need to open it in a new window.
and on Chrome page show as below


