Examine source code of NBN Availability Checker

{
  "manifest_version": 3,
  "name": "NBN Availability Checker",
  "version": "1.2.0",
  "description": "Checks NBN availability - so you don't have to.",
  "action": {
    "default_icon": "icon.png",
    "default_title": "NBN Availability Checker"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.realestate.com.au/*",
        "*://*.domain.com.au/*",
        "*://*.allhomes.com.au/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_end"
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "embed.js"
      ],
      "matches": [
        "*://*.realestate.com.au/*",
        "*://*.domain.com.au/*",
        "*://*.allhomes.com.au/*"
      ]
    }
  ],
  "host_permissions": [
    "*://*.realestate.com.au/*",
    "*://*.domain.com.au/*",
    "*://*.allhomes.com.au/*",
    "*://nbnlocationid.com/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{e32c3360-a1cc-4a5a-b84b-549719102be2}"
    }
  }
}