Examine source code of ProtonDB scraper

{
  "manifest_version": 2,
  "name": "Complementary ProtonDB for Steam",
  "version": "1.0",
  "description": "Scraps data from protondb.com reports and shows it on Steam",
  "permissions": [
    "https://www.protondb.com/*",
    "https://protondb.max-p.me/*",
    "storage"
  ],
  "icons": {
    "48": "assets/icon-48.png",
    "96": "assets/icon-96.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://store.steampowered.com/app/*"
      ],
      "js": [
        "js/protondb.js",
        "js/gamePage.js"
      ],
      "css": [
        "assets/protondb.css"
      ]
    }
  ]
}