Examine source code of URL Tracker

{
  "manifest_version": 2,
  "name": "URL Tracker",
  "version": "1.0",
  "description": "Tracks visited URLs and sends them to a backend",
  "permissions": [
    "webNavigation",
    "tabs",
    "notifications",
    "*://*/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "URL Tracker"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{81b7f8a8-08fe-4ec7-a048-f63c5b70c10b}"
    }
  }
}