Examine source code of Full Width Git Hub

{
  "manifest_version": 2,
  "name": "Full Width Git Hub",
  "description": "Adds full page width to git hub",
  "version": "2.2resigned1",
  "browser_action": {
    "default_icon": "icon.png"
  },
  "content_scripts": [
    {
      "css": [
        "styles.css"
      ],
      "matches": [
        "https://github.com/*"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{7d80751c-4c7b-4c4a-9ead-98de31420f6a}"
    }
  }
}