Examine source code of 1inch extention

{
  "name": "1inch extention",
  "version": "1.0.1",
  "manifest_version": 2,
  "description": "shows token price in title bar",
  "content_scripts": [
    {
      "matches": [
        "https://app.1inch.io/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ]
}