Examine source code of Sitting Time Tracker

{
  "manifest_version": 2,
  "name": "Sitting Time Tracker",
  "version": "1.0",
  "description": "Tracks sitting time and reminds users to move",
  "icons": {
    "48": "icon.png"
  },
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "permissions": [
    "alarms",
    "notifications",
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{8415bab5-0edd-4993-a37b-337274273f33}"
    }
  }
}