Examine source code of Reverse Image Searcher

{
  "manifest_version": 2,
  "name": "Reverse Image Searcher",
  "version": "1.0",
  "description": "Automatically search Google, Bing, and Yandex with the provided image",
  "icons": {
    "64": "icons/icon-64.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "menus"
  ]
}