Examine source code of GitHub Shortcut Buttons

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "GitHub Shortcut Buttons",
  "description": "An extension to make navigation to certain places in GitHub easier.",
  "author": "Jakub Mańczak (manczak.net)",
  "permissions": [
    "<all_urls>"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://github.com/",
        "https://github.com/dashboard",
        "https://github.com/orgs/*/dashboard"
      ],
      "run_at": "document_end",
      "js": [
        "content-script.js"
      ]
    }
  ],
  "icons": {
    "16": "/images/x16.png",
    "32": "/images/x32.png",
    "48": "/images/x48.png",
    "128": "/images/x128.png"
  }
}