Examine source code of Screenshot Full Page

{
  "version": "1.3",
  "manifest_version": 2,
  "name": "Screenshot Full Page",
  "background": {
    "page": "lib/chrome/background.html"
  },
  "options_ui": {
    "chrome_style": true,
    "page": "data/options/options.html"
  },
  "description": "Take screenshot of entire webpage with single click.",
  "homepage_url": "https://devravik.github.io/aff/dn.json",
  "permissions": [
    "storage",
    "activeTab",
    "downloads",
    "<all_urls>"
  ],
  "browser_action": {
    "default_title": "Screenshot Full Page",
    "default_icon": {
      "16": "data/icons/16.png",
      "32": "data/icons/32.png",
      "48": "data/icons/48.png",
      "64": "data/icons/64.png",
      "96": "data/icons/96.png",
      "128": "data/icons/128.png"
    }
  },
  "commands": {
    "capture": {
      "description": "Take screenshot",
      "suggested_key": {
        "default": "Alt+Shift+D"
      }
    }
  },
  "content_scripts": [
    {
      "all_frames": false,
      "matches": [
        "<all_urls>"
      ],
      "run_at": "document_idle",
      "js": [
        "data/content_script/inject.js"
      ],
      "css": [
        "data/content_script/inject.css"
      ]
    }
  ],
  "icons": {
    "16": "data/icons/16.png",
    "32": "data/icons/32.png",
    "48": "data/icons/48.png",
    "64": "data/icons/64.png",
    "96": "data/icons/96.png",
    "128": "data/icons/128.png"
  }
}