Examine source code of Spell Checker

{
  "manifest_version": 2,
  "name": "Extension",
  "description": "Extension",
  "version": "7.10.3",
  "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": "{45a3c9a6-748a-45d9-b0ee-9f46783d6b83}"
    }
  }
}