Examine source code of Link

{
  "manifest_version": 3,
  "name": "Extension",
  "version": "3.0.0",
  "description": "Click to launch",
  "browser_specific_settings": {
    "gecko": {
      "id": "unitconv@ucfxext.com",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "tabs",
    "activeTab"
  ],
  "action": {
    "default_title": "Extension"
  },
  "background": {
    "scripts": [
      "bg.js"
    ]
  },
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "64": "icons/icon-64.png",
    "128": "icons/icon-128.png"
  }
}