Examine source code of red-green-prs

{
  "manifest_version": 2,
  "name": "red-green-prs",
  "version": "1.0.1",
  "description": "A silly little project to swap the green and red on PRs in GitHub. Added lines bad. Deleted lines goood.",
  "icons": {
    "48": "icons/icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.github.com/*"
      ],
      "js": [
        "red-green-prs.js"
      ]
    }
  ]
}