Examine source code of Zammad notifications

{
  "manifest_version": 2,
  "name": "Zammad notifications",
  "version": "0.4",
  "description": "Unofficial extension to show Zammad notifications in browser",
  "homepage_url": "https://gitlab.com/maxxer/zammad-browser-ext",
  "icons": {
    "48": "images/zammad-logo-48.png"
  },
  "options_ui": {
    "page": "options/options.html",
    "browser_style": true
  },
  "background": {
    "scripts": [
      "vendor/browser-polyfill.min.js",
      "zammad-background-script.js",
      "zammad-tools.js"
    ]
  },
  "browser_action": {
    "browser_style": true,
    "default_popup": "popup/notifications.html",
    "default_icon": {
      "16": "images/zammad-logo-16.png",
      "32": "images/zammad-logo-32.png"
    }
  },
  "permissions": [
    "alarms",
    "notifications",
    "storage",
    "<all_urls>"
  ]
}