Examine source code of My Friends' Mood

{
  "manifest_version": 2,
  "name": "__MSG_extName__",
  "short_name": "MFM",
  "version": "1.1.4",
  "description": "__MSG_extDesc__",
  "author": "Raidge",
  "default_locale": "fr",
  "options_ui": {
    "page": "options.html"
  },
  "applications": {
    "gecko": {
      "id": "firefox.addon@myfriendsmood.fr"
    }
  },
  "browser_action": {
    "default_icon": {
      "16": "img/mfm16.png",
      "48": "img/mfm48.png",
      "96": "img/mfm96.png",
      "128": "img/mfm128.png"
    },
    "default_title": "My Friends' Mood",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "lang.js",
        "MainInfo.js",
        "SearchList.js"
      ],
      "run_at": "document_end"
    }
  ],
  "background": {
    "scripts": [
      "lang.js",
      "popup.js",
      "SearchList.js"
    ]
  },
  "icons": {
    "16": "img/mfm16.png",
    "48": "img/mfm48.png",
    "128": "img/mfm128.png"
  },
  "permissions": [
    "tabs",
    "activeTab",
    "https://www.facebook.com/me/friends",
    "storage"
  ]
}