Laravel Debugbar v4.0 has been released with major improvements including modern JavaScript (removing jQuery), better performance, improved dataset switching for redirects and AJAX requests, and new features like HTTP client monitoring and webhook scanning. This popular development tool with over 118 million downloads now offers enhanced Inertia and Livewire support, dark mode, and better data collection throughout the request lifecycle. It's a great tool that we use daily at Jump24 so its great to see this new version being released.