Examine source code of Boustrophedon Reader

{
  "manifest_version": 2,
  "name": "Boustrophedon Reader",
  "version": "1.1",
  "description": "Displays selected text in Boustrophedon style.",
  "permissions": [
    "activeTab",
    "tabs",
    "storage"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/16.png",
      "48": "icons/48.png",
      "128": "icons/128.png"
    }
  },
  "icons": {
    "16": "icons/16.png",
    "48": "icons/48.png",
    "128": "icons/128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{5b477404-da20-4b8c-96f0-1b65979f7545}"
    }
  }
}