Examine source code of Web Goal Tracker

{
  "manifest_version": 2,
  "name": "Web Goal Tracker",
  "version": "1.3",
  "description": "Track your web usage goals, get alerts, and export data.",
  "permissions": [
    "tabs",
    "storage",
    "notifications",
    "alarms",
    "activeTab"
  ],
  "background": {
    "scripts": [
      "utils.js",
      "background.js"
    ],
    "persistent": true
  },
  "browser_action": {
    "default_icon": "icons/logo_64.png",
    "default_popup": "popup.html"
  },
  "icons": {
    "32": "icons/logo_32.png",
    "64": "icons/logo_64.png",
    "128": "icons/logo_128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f099ab8e-6c0d-43c8-839d-458b07cc2fb6}"
    }
  }
}