Examine source code of No History Tracker

{
  "manifest_version": 2,
  "name": "No History Tracker",
  "version": "1.1",
  "description": "Extension to disable the tracking of URLs of browser histories.",
  "author": "keiwsh",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "browser_style": true
  },
  "permissions": [
    "*://*/*",
    "history",
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{34087338-515e-4d3a-94a1-433754da4186}"
    }
  }
}