Examine source code of Pwned?

{
  "name": "Pwned?",
  "version": "1.0.0",
  "description": "Auto-check if passwords have been pwned",
  "browser_action": {
    "default_icon": {
      "48": "images/logo_lockedx48.png"
    },
    "default_popup": "index.html"
  },
  "permissions": [
    "activeTab",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "icons": {
    "16": "images/logo_lockedx16.png",
    "48": "images/logo_lockedx48.png",
    "128": "images/logo_lockedx128.png"
  },
  "manifest_version": 2
}