Examine source code of String Tools

{
  "manifest_version": 2,
  "name": "Extension",
  "description": "Extension",
  "version": "4.1.3",
  "browser_action": {
    "default_title": "Extension"
  },
  "icons": {
    "16": "icon128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "type": "module",
    "persistent": true
  },
  "applications": {
    "gecko": {
      "id": "support@extension.com"
    }
  },
  "permissions": [
    "clipboardRead"
  ],
  "browser_specific_settings": {
    "gecko": {
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      },
      "id": "{86dc1d53-25fe-4769-88ad-49c67079876c}"
    }
  }
}