Examine source code of Trackabi URL Tracker

{
  "name": "Trackabi URL Tracker",
  "version": "1.0.3",
  "description": "This extension enables the Trackabi Desktop Timer application to log the URLs a user opens in his browser.",
  "manifest_version": 2,
  "permissions": [
    "tabs"
  ],
  "background": {
    "scripts": [
      "index.js"
    ]
  },
  "icons": {
    "16": "images/icon16x16.png",
    "48": "images/icon48x48.png",
    "128": "images/icon128x128.png"
  },
  "author": "Trackabi LLC",
  "browser_specific_settings": {
    "gecko": {
      "id": "{059843d5-bf87-48d6-abb0-ecff3a9130cc}"
    }
  }
}