Examine source code of Karesz Clicker Hack

{
  "name": "Karesz Clicker Hack",
  "description": "420 karesz speedrun wr any%",
  "icons": {
    "128": "./images/karesz.png"
  },
  "version": "1.2.2",
  "manifest_version": 2,
  "browser_action": {
    "default_icon": "./images/karesz.png",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://tomasajt.github.io/kareszClicker/",
        "*://beni69.github.io/kareszClicker/"
      ],
      "js": [
        "content.js"
      ]
    }
  ]
}