Examine source code of Quickly Screenshot & Screen Capture

{
  "name": "Quickly Screenshot & Screen Capture",
  "description": "Click, highlight, screenshot ready",
  "manifest_version": 2,
  "version": "1.0.0",
  "background": {
    "scripts": [
      "js/background.js"
    ]
  },
  "browser_action": {
    "default_icon": "img/32.png"
  },
  "icons": {
    "16": "img/16.png",
    "24": "img/24.png",
    "32": "img/32.png",
    "64": "img/64.png",
    "128": "img/128.png",
    "256": "img/256.png",
    "512": "img/512.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "css": [
        "css/jquery.Jcrop.min.css",
        "css/content.css"
      ],
      "js": [
        "js/jquery.min.js",
        "js/jquery.Jcrop.min.js",
        "js/content.js"
      ],
      "run_at": "document_start"
    }
  ],
  "permissions": [
    "storage",
    "<all_urls>",
    "clipboardWrite"
  ],
  "web_accessible_resources": [
    "css/content.css",
    "img/Jcrop.gif",
    "img/pixel.png"
  ],
  "developer": {
    "name": "Mohsin Ali",
    "url": "https://fiverr.com/mohsinaliryk"
  }
}