Examine source code of Smsonline

{
  "name": "Smsonline",
  "description": "Smsonline sms checker",
  "author": "Stéphane Codazzi",
  "version": "0.9resigned1",
  "manifest_version": 2,
  "default_locale": "en",
  "icons": {
    "128": "img/logo-128.png"
  },
  "browser_action": {
    "default_icon": {
      "128": "img/logo-128.png"
    },
    "default_title": "Smsonline",
    "default_popup": "window.html"
  },
  "background": {
    "scripts": [
      "js/config.js",
      "js/jzodlib.min.js",
      "js/background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{93866257-f682-471b-b3cb-ba362aae5a48}"
    }
  }
}