Examine source code of OOF! Clicker

{
  "description": "OOF clicker play oof clicker online/offline",
  "manifest_version": 2,
  "name": "oof clicker",
  "version": "1.1.0",
  "homepage_url": "https://github.com/techtimefor",
  "icons": {
    "48": "icons/page-48.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": "icons/page-32.png"
  }
}