Show link to install app from: - developers.facebook.com/apps/APP_ID - http://facebook.com/PAGE_USERNAME/app_APP_ID - http://facebook.com/pages/PAGE_NAME/PAGE_ID?v=app_APP_ID (v = sk)

command.js

var app_id = location.href.match(/(?:app(?:s\/|_))([0-9]+)/).pop();
var url = 'https://facebook.com/dialog/pagetab?app_id={app_id}&redirect_uri=http://facebook.com';

window.prompt("Copy URL [ctrl + c]", url.replace('{app_id}', app_id));

command.json

{
  "name": "Facebook Install App",
  "description": "Install facebook app if you are on fan or developers page of the app",
  "icon": "http://www.caironet.net/images/social-networks-facebook.png",
  "link": "http://joseadrian.com"
}