Examine source code of GitHub Code Collapse

{
  "manifest_version": 2,
  "name": "GitHub Code Collapse",
  "version": "0.1.1resigned1",
  "description": "Collapse code area on github.com to more directly access README files.",
  "icons": {
    "48": "icons/border-48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.github.com/*"
      ],
      "js": [
        "index.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{748cadb1-ec9c-4242-9615-e064791f20cd}"
    }
  }
}