Examine source code of Codeforces Rating Hider

{
  "manifest_version": 3,
  "name": "Codeforces Rating Hider",
  "version": "0.1.0",
  "description": "Hide problem ratings on Codeforces to reduce psychological bias while solving.",
  "icons": {
    "48": "icons/icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "codeforces-rating-hider@hemil087",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.codeforces.com/*"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "styles.css"
      ],
      "run_at": "document_idle"
    }
  ]
}