Examine source code of Lazy Image Loader

{
  "background": {
    "scripts": [
      "js/background.js"
    ]
  },
  "content_scripts": [
    {
      "all_frames": true,
      "js": [
        "js/lazy.js"
      ],
      "matches": [
        "<all_urls>"
      ],
      "run_at": "document_start"
    }
  ],
  "description": "Load images lazily",
  "icons": {
    "48": "res/sloth.png"
  },
  "manifest_version": 2,
  "name": "Lazy Image Loader",
  "page_action": {
    "default_icon": {
      "48": "res/sloth.png"
    },
    "default_popup": "res/popup.html"
  },
  "permissions": [
    "<all_urls>",
    "storage",
    "webRequest",
    "webRequestBlocking"
  ],
  "version": "6",
  "web_accessible_resources": [
    "res/placeholder.png"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{90c95840-0e28-40cb-b0e7-e893a7cf99a8}"
    }
  }
}