Examine source code of Hide Chess.com Elo

{
  "manifest_version": 3,
  "name": "Hide Chess.com Elo",
  "version": "1.2.0",
  "description": "Censors/hides Elo ratings on chess.com.",
  "icons": {
    "48": "icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.chess.com/*"
      ],
      "exclude_matches": [
        "*://*.chess.com/ratings*"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "style.css"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "hide-chess-elo@my-personal-project.com"
    }
  }
}