Examine source code of New Tab for Github Checks

{
  "manifest_version": 2,
  "name": "New Tab for Github Checks",
  "description": "Opens a new tab for links in Github checks",
  "homepage_url": "https://github.com/pmsanford/new-tab-github-checks",
  "version": "1.0",
  "icons": {
    "48": "icons/icon.png",
    "96": "icons/icon@2x.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://github.com/*",
        "*://*.github.com/*",
        "https://github.com/*"
      ],
      "js": [
        "./new-tab-github-checks.js"
      ]
    }
  ]
}