Examine source code of Text Direction Toggler

{
  "manifest_version": 2,
  "name": "Text Direction Toggle",
  "version": "1.0",
  "description": "Toggle webpage text direction (LTR/RTL) with a single click.",
  "icons": {
    "48": "icon.png"
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{8c98658f-bf47-41ae-9408-db54b22e59c2}"
    }
  }
}