Examine source code of Reverse Image Search

{
  "name": "Reverse Image Search",
  "description": "a powerful capturing reverse image search tool built on top of TinEye/Google Images engines",
  "version": "0.2.3",
  "manifest_version": 2,
  "permissions": [
    "storage",
    "<all_urls>",
    "contextMenus"
  ],
  "background": {
    "persistent": false,
    "scripts": [
      "background.js"
    ]
  },
  "homepage_url": "https://add0n.com/reverse-image-search.html",
  "icons": {
    "16": "data/icons/16.png",
    "24": "data/icons/24.png",
    "32": "data/icons/32.png",
    "48": "data/icons/48.png",
    "64": "data/icons/64.png",
    "128": "data/icons/128.png",
    "256": "data/icons/256.png"
  },
  "browser_action": {}
}