Examine source code of Gitark

{
  "name": "Gitark",
  "version": "0.1.0",
  "short_name": "Gitark",
  "author": "imfunny and community",
  "description": "the most popular dark theme extension for github",
  "manifest_version": 2,
  "icons": {
    "16": "./assets/icons/icon3.png",
    "48": "./assets/icons/icon2.png",
    "128": "./assets/icons/icon1.png"
  },
  "content_scripts": [
    {
      "css": [
        "src/style.css"
      ],
      "matches": [
        "https://github.com/*"
      ],
      "js": [
        "src/content.js"
      ],
      "run_at": "document_start"
    }
  ]
}