Examine source code of WorkTime Tracker

{
  "manifest_version": 2,
  "name": "WorkTime Tracker",
  "version": "1.0",
  "description": "Track your working hours and breaks with an intuitive interface",
  "permissions": [
    "storage",
    "activeTab",
    "idle",
    "alarms",
    "notifications"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "WorkTime Tracker"
  },
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{86a88312-6c57-41f7-9d93-804ce190495f}"
    }
  }
}