Examine source code of Coolify

{
  "name": "Coolify",
  "version": "1.0.1",
  "description": "Make your browsing experience cool, cool cool cool.",
  "permissions": [
    "activeTab"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_title": "Coolify!",
    "default_icon": {
      "16": "images/coolify16.png",
      "32": "images/coolify32.png",
      "48": "images/coolify48.png",
      "128": "images/coolify128.png"
    }
  },
  "icons": {
    "16": "images/coolify16.png",
    "32": "images/coolify32.png",
    "48": "images/coolify48.png",
    "128": "images/coolify128.png"
  },
  "manifest_version": 2
}