Examine source code of GitHub Superfilter

{
  "manifest_version": 2,
  "name": "GitHub Superfilter",
  "version": "1.1.0",
  "author": "Tomer Ron",
  "description": "Adds a lovely filter to GitHub pull requests",
  "homepage_url": "https://github.com/TomerRon/github-superfilter",
  "content_scripts": [
    {
      "matches": [
        "*://*.github.com/*"
      ],
      "js": [
        "bundle.js"
      ]
    }
  ],
  "icons": {
    "48": "assets/icon.png",
    "96": "assets/icon@2x.png"
  }
}