Examine source code of Chess Utils

{
  "manifest_version": 3,
  "name": "Chess Utils",
  "version": "0.0.14",
  "description": "Chess.com utilities like a lichess game review button, shortcuts to copy the game or position and highlighting the selected piece",
  "icons": {
    "16": "assets/icons/icon-16.png",
    "48": "assets/icons/icon-48.png",
    "128": "assets/icons/icon-128.png"
  },
  "action": {
    "default_title": "Chess Utils",
    "default_popup": "popup/popup.html"
  },
  "commands": {
    "copy-game": {
      "suggested_key": {
        "default": "Alt+Shift+O"
      },
      "description": "Copy current game"
    },
    "copy-position": {
      "suggested_key": {
        "default": "Alt+Shift+P"
      },
      "description": "Copy current position"
    }
  },
  "host_permissions": [
    "https://www.chess.com/*",
    "https://lichess.org/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://www.chess.com/*"
      ],
      "js": [
        "browser-polyfill.js",
        "content-scripts/notifications.js",
        "content-scripts/chesscom.js"
      ],
      "run_at": "document_start"
    },
    {
      "matches": [
        "https://lichess.org/*"
      ],
      "js": [
        "browser-polyfill.js",
        "content-scripts/lichess.js"
      ],
      "run_at": "document_start"
    }
  ],
  "permissions": [
    "storage",
    "scripting"
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "assets/pieces/simple/bp.png",
        "assets/pieces/simple/bn.png",
        "assets/pieces/simple/bb.png",
        "assets/pieces/simple/br.png",
        "assets/pieces/simple/bq.png",
        "assets/pieces/simple/bk.png",
        "assets/pieces/simple/wp.png",
        "assets/pieces/simple/wn.png",
        "assets/pieces/simple/wb.png",
        "assets/pieces/simple/wr.png",
        "assets/pieces/simple/wq.png",
        "assets/pieces/simple/wk.png",
        "assets/pieces/shaded/bp.png",
        "assets/pieces/shaded/bn.png",
        "assets/pieces/shaded/bb.png",
        "assets/pieces/shaded/br.png",
        "assets/pieces/shaded/bq.png",
        "assets/pieces/shaded/bk.png",
        "assets/pieces/shaded/wp.png",
        "assets/pieces/shaded/wn.png",
        "assets/pieces/shaded/wb.png",
        "assets/pieces/shaded/wr.png",
        "assets/pieces/shaded/wq.png",
        "assets/pieces/shaded/wk.png"
      ],
      "matches": [
        "https://www.chess.com/*",
        "https://lichess.org/*"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "type": "module"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "chess-utils@chesslab.app",
      "strict_min_version": "113.0"
    }
  }
}