Examine source code of Melvor Idle Cheat Engine

{
  "manifest_version": 2,
  "name": "Melvor Idle Cheat Engine",
  "version": "0.7.5",
  "description": "Hacking Melvor Idle, the fun idle browser game!",
  "icons": {
    "48": "icons/border-48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://melvoridle.com/*",
        "*://www.melvoridle.com/*",
        "*://test.melvoridle.com/*"
      ],
      "js": [
        "MICE.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "inject-mice.js",
    "icons/*.png"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{7bb5fd2a-1674-447d-b8c0-d8e860cc98db}"
    }
  }
}