Examine source code of Development Tenant Banner

{
  "manifest_version": 3,
  "name": "Development Tenant Banner",
  "version": "1.2.1",
  "description": "Shows a banner identifying which Development tenant - or any other environment you define - you're currently viewing.",
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "permissions": [
    "storage",
    "activeTab"
  ],
  "optional_host_permissions": [
    "http://*/*",
    "https://*/*"
  ],
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    },
    "default_title": "Development Tenant Banner"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle",
      "all_frames": false
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "Development-tenant-banner@thehattons.co",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}