Examine source code of SmartLoad

{
  "name": "LazyLoadify",
  "author": "Gildas Lormeau",
  "homepage_url": "https://github.com/gildas-lormeau/LazyLoadify",
  "description": "Web extension to force lazy loading of non-displayed resources (i.e. image, frame, video and audio contents)",
  "version": "0.0.2",
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "run_at": "document_start",
      "all_frames": true,
      "js": [
        "index.js"
      ]
    }
  ],
  "permissions": [],
  "incognito": "spanning",
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko": {
      "id": "{2767b4bf-923e-41b2-a4d3-c227baf95e84}"
    }
  }
}