Examine source code of Privatizer

{
  "manifest_version": 2,
  "name": "Privatizer",
  "description": "Transfer a tab from normal to private browsing",
  "version": "0.0.1",
  "icons": {
    "64": "icons/icon.png"
  },
  "background": {
    "scripts": [
      "background_script.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "64": "icons/icon.png"
    },
    "default_popup": "browserAction/index.html",
    "default_title": "Privatizer"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{06d91123-3546-4c6f-b415-de33239292f2}"
    }
  }
}