Examine source code of Proxycheck for Firefox

{
  "manifest_version": 2,
  "name": "Proxycheck",
  "version": "1.1.3",
  "description": "Adds an option to check an IP and email address with proxycheck.io and block the IP or ASN in Cloudflare.",
  "permissions": [
    "storage",
    "contextMenus",
    "activeTab",
    "tabs",
    "https://proxycheck.io/*",
    "https://api.cloudflare.com/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_security_policy": "script-src 'self'; object-src 'self'; connect-src 'self' https://proxycheck.io https://api.cloudflare.com; img-src 'self'; style-src 'self' 'unsafe-inline';",
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_action": {
    "default_popup": "settings.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "roxana.schram@gmail.com",
      "strict_min_version": "115.0"
    }
  }
}