Examine source code of Realtime History Tracker

{
  "manifest_version": 2,
  "name": "Realtime History Tracker",
  "version": "1.0",
  "description": "Track visited URLs in real time",
  "permissions": [
    "tabs"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Realtime History Tracker"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f8a03929-6bab-46db-8ee4-2323808662a1}"
    }
  }
}