Examine source code of PrivateSearch

{
  "manifest_version": 2,
  "name": "PrivateSearch",
  "description": "Search selected text in a private window",
  "version": "1.0",
  "author": "Ashman",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "12": "icons/privatesearch-12.png",
    "16": "icons/privatesearch-16.png",
    "32": "icons/privatesearch-32.png",
    "48": "icons/privatesearch-48.png",
    "64": "icons/privatesearch-64.png"
  },
  "permissions": [
    "tabs",
    "search",
    "contextMenus"
  ]
}