Examine source code of LichessMouseBlock

{
  "manifest_version": 2,
  "name": "LichessMouseBlock",
  "version": "1.0",
  "description": "Block the annoying scrolling of moves on lichess if you are a Magic Mouse user.",
  "icons": {
    "48": "icons/border-48.png"
  },
  "content_scripts": [
    {
      "js": [
        "script.js"
      ],
      "matches": [
        "https://*.lichess.org/*"
      ],
      "run_at": "document_start"
    }
  ]
}