Examine source code of YouTube Column Swapper

{
  "manifest_version": 2,
  "name": "YouTube Column Swapper",
  "version": "1.0.1",
  "description": "Adjusts YouTube's layout by swapping columns, optimizing the interface for users with the desktop panel on the left-hand side",
  "icons": {
    "48": "icon.png"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_icon": "icon.png",
    "default_title": "YouTube Columns Swap",
    "default_popup": "popup/popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{5d2e6670-08d0-4fd7-a43a-7f5131fdd0df}"
    }
  }
}