Examine source code of A2OJ Enhancer

{
  "manifest_version": 2,
  "name": "A2OJ Enhancer",
  "description": "Make A2OJ dynamic again!",
  "version": "3.0.3",
  "icons": {
    "128": "icons/icon-128x128.png"
  },
  "browser_action": {
    "default_icon": {
      "128": "icons/icon-128x128.png"
    },
    "default_title": "A2OJ Enhancer",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "https://a2oj.pratikdaigavane.me/*"
      ],
      "js": [
        "js/jquery-3.4.1.min.js",
        "js/bootstrap.min.js",
        "js/content.js"
      ],
      "css": [
        "css/content.css",
        "css/bootstrap.min.css"
      ]
    }
  ],
  "permissions": [
    "storage",
    "https://a2oj.pratikdaigavane.me/*",
    "*://codeforces.com/*"
  ]
}