Examine source code of YouTube IT

{
  "manifest_version": 2,
  "name": "YoutubeIT",
  "description": "Search selected text in YouTube",
  "version": "1.1resigned1",
  "homepage_url": "http://www.outofmemory.blog.br/youtube-it/",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "activeTab",
    "tabs",
    "contextMenus"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "youtubeit_aechiara@gmail.com"
    }
  }
}