Examine source code of Blindfolded on Lichess

{
  "manifest_version": 2,
  "name": "Blindfolded on Lichess",
  "version": "1.1",
  "description": "You're blind",
  "icons": {
    "48": "icons/icon-48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.lichess.org/*"
      ],
      "js": [
        "Blindfold.js"
      ]
    }
  ]
}