Examine source code of Perceptual image search

{
  "manifest_version": 2,
  "name": "__MSG_extensionName__",
  "version": "0.2.3resigned1",
  "description": "__MSG_extensionDescription__",
  "homepage_url": "http://tools.quadet.com/",
  "default_locale": "en",
  "applications": {
    "gecko": {
      "strict_min_version": "56.0a1",
      "id": "perceptual-image-search-extension@quadet.com"
    }
  },
  "minimum_chrome_version": "6.0.0.0",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "storage",
    "contextMenus",
    "https://image.baidu.com/*",
    "https://www.bing.com/images/*",
    "https://www.google.com/*",
    "https://tineye.com/*",
    "https://yandex.com/images/*",
    "https://yandex.ru/images/*",
    "https://yandex.by/images/*",
    "https://yandex.ua/images/*",
    "https://yandex.kz/images/*",
    "https://yandex.com.tr/images/*",
    "*://*/*"
  ],
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "64": "icons/icon-64.png",
    "96": "icons/icon-96.png",
    "128": "icons/icon-128.png"
  }
}