Examine source code of Big Navigation

{
  "manifest_version": 2,
  "name": "Big Navigation",
  "version": "2.6resigned1",
  "description": "__MSG_extensionDescription__",
  "default_locale": "en",
  "homepage_url": "https://github.com/temnikov/bignavigation",
  "icons": {
    "48": "icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "css": [
        "bignavigation.css"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "bignavigation.vaka@gmail.com"
    }
  }
}