Examine source code of TabXporter Pro

{
  "manifest_version": 2,
  "name": "TabXporter Pro",
  "version": "1.0",
  "description": "Manage & organise open tabs with a user-friendly view, search, highlight duplicates, and export tab lists in multiple formats.",
  "permissions": [
    "tabs",
    "activeTab",
    "storage",
    "downloads"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{061c9849-921e-418d-b1b5-33be60c442d7}"
    }
  }
}