Examine source code of Toggle Page Direction

{
  "manifest_version": 2,
  "name": "Toggle Page Direction",
  "version": "1.0",
  "description": "Toggle the text direction of any webpage between LTR and RTL.",
  "permissions": [
    "activeTab"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_icon": "icons/icon.png"
  },
  "icons": {
    "48": "icons/icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{c5d39da3-8f16-43c4-bf2e-da9ed2c4b76c}"
    }
  }
}