Examine source code of Qastle Wallet

{
  "manifest_version": 2,
  "name": "Qastle Wallet",
  "description": "Designed for simplicity, security, and cross-platform use, Qastle brings quantum-grade protection to mainstream crypto users.",
  "version": "1.3.4",
  "short_name": "Qastle",
  "icons": {
    "16": "icon/16.png",
    "32": "icon/32.png",
    "48": "icon/48.png",
    "96": "icon/96.png",
    "128": "icon/128.png"
  },
  "permissions": [
    "storage",
    "unlimitedStorage",
    "tabs",
    "activeTab",
    "https://purchase.krown.network/*",
    "https://dev-purchase.krown.network/*",
    "https://staging-purchase.krown.network/*",
    "http://localhost/*",
    "http://127.0.0.1/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{1bcd9eb3-98d5-4283-a65b-c3163e45340d}"
    }
  },
  "web_accessible_resources": [
    "injected-provider.js"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Qastle",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "http://127.0.0.1/*",
        "http://localhost/*",
        "https://dev-purchase.krown.network/*",
        "https://purchase.krown.network/*",
        "https://staging-purchase.krown.network/*"
      ],
      "run_at": "document_start",
      "js": [
        "content-scripts/content.js"
      ]
    }
  ]
}