Examine source code of Sheldonify

{
  "manifest_version": 2,
  "name": "Sheldonify",
  "version": "1.0",
  "description": "This is an extension which replaces all images by Sheldon pictures. It works on all websites which use <img> or <div> with the \"background-image\" CSS property.",
  "icons": {
    "48": "icons/icon-48.jpg",
    "96": "icons/icon-96.jpg"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "sheldonify.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "imgs/1.jpg",
    "imgs/2.jpg",
    "imgs/3.jpg",
    "imgs/4.jpg",
    "imgs/5.jpg",
    "imgs/6.jpg",
    "imgs/7.jpg",
    "imgs/8.jpg",
    "imgs/9.jpg",
    "imgs/10.jpg",
    "imgs/11.jpg"
  ]
}