Examine source code of Amoguschess

{
  "content_scripts": [
    {
      "js": [
        "lichess.js"
      ],
      "matches": [
        "https://lichess.org/*"
      ]
    },
    {
      "js": [
        "chess.js"
      ],
      "matches": [
        "https://www.chess.com/*"
      ]
    }
  ],
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "manifest_version": 2,
  "name": "Amoguschess",
  "version": "1.0.0"
}