Examine source code of Opponent Insights for Lichess & Chess.com

{
  "manifest_version": 3,
  "name": "Opponent Insights for Lichess & Chess.com",
  "version": "1.3.0",
  "description": "Shows opponent stats (ratings, recent form, favorite openings) right on the game page on Lichess or Chess.com.",
  "permissions": [
    "storage"
  ],
  "host_permissions": [
    "https://lichess.org/*",
    "https://api.chess.com/*",
    "https://www.chess.com/*",
    "https://chess.com/*",
    "https://poodlechess.com/*",
    "https://www.poodlechess.com/*"
  ],
  "background": {
    "service_worker": "background.js",
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "opponent-insights@poodlechess.com",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": [
          "websiteContent"
        ]
      }
    }
  },
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://lichess.org/*"
      ],
      "js": [
        "site-lichess.js",
        "content.js"
      ],
      "run_at": "document_idle"
    },
    {
      "matches": [
        "https://www.chess.com/*",
        "https://chess.com/*"
      ],
      "js": [
        "site-chesscom.js",
        "content.js"
      ],
      "run_at": "document_idle"
    },
    {
      "matches": [
        "https://poodlechess.com/*",
        "https://www.poodlechess.com/*"
      ],
      "js": [
        "poodlechess-import.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "panel.css"
      ],
      "matches": [
        "https://lichess.org/*",
        "https://www.chess.com/*",
        "https://chess.com/*"
      ]
    }
  ]
}