Examine source code of GitHub Dashboard Fix

{
  "name": "GitHub Dashboard Fix",
  "version": "1.2.1resigned1",
  "manifest_version": 2,
  "description": "Injects switch button in GitHub",
  "homepage_url": "http://aashutoshrathi.co",
  "content_scripts": [
    {
      "matches": [
        "*://*.github.com/*"
      ],
      "js": [
        "switch.js"
      ]
    }
  ],
  "icons": {
    "48": "img/icon-48x48.png",
    "96": "img/icon-96x96.png"
  },
  "browser_action": {
    "default_title": "GitHub Dashboard Fix"
  },
  "web_accessible_resources": [
    "toggle.css"
  ],
  "permissions": [
    "storage",
    "tabs",
    "https://www.github.com/",
    "https://github.com/"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{a1bb7230-df9a-4ead-b2b9-ed8b6dc19e8e}"
    }
  }
}