Examine source code of Chesscom Enhancer

{
  "manifest_version": 2,
  "name": "Chesscom Enhancer",
  "description": "A free and open source extension that adds new features to Chess.com matches.",
  "version": "1.0.0",
  "permissions": [
    "storage",
    "https://lichess.org/api/import",
    "https://www.chess.com/*"
  ],
  "icons": {
    "128": "images/icon128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.chess.com/game/*",
        "https://www.chess.com/play/*"
      ],
      "js": [
        "content/features/helpers.js",
        "content/features/eventDispatcher.js",
        "content/features/hideRating.js",
        "content/features/lichessReviewButton.js",
        "content/features/timeWarning.js",
        "content/features/lifetimeScore.js",
        "content/features/anonymizeOpponent.js",
        "content/features/quickOptions.js",
        "content/features/sessionMode.js",
        "content/features/gameControls.js",
        "content/content.js"
      ],
      "css": [
        "content/css/hideRating.css",
        "content/css/lichessReviewButton.css",
        "content/css/timeWarning.css",
        "content/css/lifetimeScore.css",
        "content/css/anonymizeOpponent.css",
        "content/css/quickOptions.css",
        "content/css/sessionMode.css",
        "content/css/gameControls.css"
      ]
    }
  ],
  "web_accessible_resources": [
    "images/icon128.png",
    "content/css/hideRating.css",
    "content/css/lichessReviewButton.css",
    "content/css/timeWarning.css",
    "content/css/lifetimeScore.css",
    "content/css/anonymizeOpponent.css",
    "content/css/quickOptions.css",
    "content/css/sessionMode.css",
    "content/css/gameControls.css",
    "popup/popup.html"
  ],
  "browser_action": {
    "default_title": "Chesscom Enhancer",
    "default_popup": "popup/popup.html",
    "default_icon": "images/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{4dbc93cb-7eed-47c3-bbc4-418bdbb57776}"
    }
  }
}