Examine source code of GitHub Weekends

{
  "manifest_version": 2,
  "name": "GitHub Weekends",
  "version": "1.0.1",
  "description": "A silly browser extension that marks weekend contributions on GitHub in red.",
  "content_scripts": [
    {
      "matches": [
        "*://*.github.com/*"
      ],
      "js": [
        "weekend.js"
      ]
    }
  ],
  "icons": {
    "48": "icons/icon.svg",
    "96": "icons/icon.svg"
  }
}