Chrome DevTools (MCP) for your AI agent
You can now check out a preview for the new Chrome DevTools Model Context Protocol (MCP) server. It brings the power of Chrome DevTools to AI coding assistants.
Previously, coding agents weren't able to see what the code they generate actually does when it runs in the browser. The Chrome DevTools MCP server changes this. AI coding assistants are able to debug web pages directly in Chrome, and benefit from DevTools debugging capabilities and performance insights. This improves their accuracy when identifying and fixing issues.
See for yourself how it works:
For more information see Chrome DevTools (MCP) for your AI agent.
Debug the network dependency tree with Gemini
The Performance > Insights > Network dependency tree insight now has the Debug with AI button that takes you to the AI assistance panel, so you can discuss and debug said tree with the help of Gemini.
Export your chats with Gemini
You can now export your current chat with Gemini or copy its response to clipboard by clicking the Export conversation button at the top action bar or Copy response under the Gemini's message in the chat.
Persisted track configuration in the Performance panel
When you configure a recorded track in the Performance panel, DevTools now saves your configuration and applies it when you import it back or record a new one.
Filter IP protected network requests
In the Network panel, you can now filter requests sent to IP Protection proxies.
Elements > Layout tab adds masonry layout support
You can now inspect masonry layout in the Elements > Styles tab.
Masonry layout is a layout method where one axis uses a typical strict grid layout, most often columns, and the other a masonry layout.
Lighthouse 12.8.2
The Lighthouse panel now runs Lighthouse 12.8.2.
Most notably in this version, Lighthouse separates found issues with CSS custom properties into their own error messages.
See also the full list of changes.
To learn the basics of using the Lighthouse panel in DevTools, see Lighthouse: Optimize website speed.
Chromium issue: 40543651.
Miscellaneous highlights
These are some of many notable fixes and improvements in this release:
- Performance: Request Idle callback events now include the
timeoutproperty (crbug.com/441679219). - Accessibility. Screen readers will now read out the following:
- 'This is a new feature' for promoted command menu items (crbug.com/441485154).
- Code completion summary toolbar (crbug.com/433952045).
- Network: Right clicking a network log item selects it (crbug.com/368510578).
Download the preview channels
Consider using the Chrome Canary, Dev, or Beta as your default development browser. These preview channels give you access to the latest DevTools features, let you test cutting-edge web platform APIs, and help you find issues on your site before your users do!
Get in touch with the Chrome DevTools team
Use the following options to discuss the new features, updates, or anything else related to DevTools.
- Submit feedback and feature requests to us at crbug.com.
- Report a DevTools issue using the More options > Help > Report a DevTools issue in DevTools.
- Tweet at @ChromeDevTools.
- Leave comments on What's new in DevTools YouTube videos or DevTools Tips YouTube videos.
What's new in DevTools
A list of everything that has been covered in the What's new in DevTools series.
- DevTools MCP server updates
- Improved trace sharing
- Support for @starting-style
- Editor widget for display: masonry
- Lighthouse 13
- Code suggestions from Gemini
- Enhancements for the DevTools MCP server
- Quicker access to AI assistance
- Debug the full performance trace with Gemini
- Toggle drawer orientation
- Google Developer Program
- Miscellaneous highlights
- Chrome DevTools (MCP) for your AI agent
- Debug the network dependency tree with Gemini
- Export your chats with Gemini
- Persisted track configuration in the Performance panel
- Filter IP protected network requests
- Elements > Layout tab adds masonry layout support
- Lighthouse 12.8.2
- Miscellaneous highlights
- Debug more insights with Gemini
- Emulate the 'Save-Data' header in 'Network conditions'
- See the Baseline status in a CSS property tooltip
- Override form factors in user agent client hints
- Lighthouse 12.8.0
- Miscellaneous highlights
- A more reliable and productive Chrome DevTools
- Upload images in AI assistance for styling
- Add request headers to the table in Network
- Check out the highlights from Google I/O 2025
- Miscellaneous highlights
- Performance panel improvements
- Preconnected origins in 'Network dependency tree' insight
- Server response and redirection times in 'Document request latency' insight
- Redirects in Summary of network requests
- Reduced noise in the performance trace
- Deprecated 'Disable JavaScript samples'
- Geolocation accuracy parameter in Sensors
- Elements panel improvements
- Debug complex CSS values easier
- @function support in Elements > Styles
- Network panel improvements
- has-request-header filter
- Direct Sockets in Isolated Web Apps
- Miscellaneous highlights
- Accessibility
- Google I/O 2025 edition
- Modify and save CSS changes to your workspace with Gemini
- Connect a workspace folder and save changes back to your source files
- Ask Gemini about performance insights
- Annotate performance findings with Gemini
- Add screenshots to your chats with Gemini
- New insights in the Performance panel
- Duplicated JavaScript
- Legacy JavaScript
- Speculations now support rule tags
- Lighthouse 12.6.0
- Miscellaneous highlights
- Accessibility
- Performance panel improvements
- New performance insights
- Click to highlight
- Server timings in Summary of network requests
- Filter cookies in 'Privacy and security'
- Sizes in kB units in tables across panels
- Autocomplete supports corner-shape and corner-*-shape in Elements > Styles
- Experimental: Highlighting issues with elements and attributes in DOM
- Lighthouse 12.5.0
- Miscellaneous highlights
- Performance panel improvements
- Origin and script links for profile and function calls in Performance
- LCP by phase field data support
- Network dependency tree insight
- Duration instead of total and self time in Summary
- Heaviest stack highlighting
- Improved empty states for various panels
- Accessibility tree view in Elements
- Lighthouse 12.4.0
- Miscellaneous highlights
- Privacy and security panel
- Performance panel improvements
- Calibrated CPU throttling presets
- Select different performance events in the same AI chat
- First- and third-party highlighting in Performance
- Field data in marker tooltips and insights
- Forced reflow insight
- 'Optimize DOM size' insight
- Extend the performance trace with console.timeStamp
- Elements panel improvements
- Real-time values of animated styles
- Support for :open pseudo-class and various pseudo-elements
- Copy all console messages
- Byte units in the Memory panel
- Miscellaneous highlights
- Persistent AI chat history
- Performance panel improvements
- Image delivery insight
- Classic and modern keyboard navigation
- Ignore irrelevant scripts in the flame chart
- Timeline marker and range highlighting on hover
- Recommended throttling settings
- Timings markers in an overlay
- Stack traces of JS calls in Summary
- Badge settings moved to menu in Elements
- New 'What's new' panel
- Lighthouse 12.3.0
- Miscellaneous highlights
- Debug network requests, source files, and performance traces with Gemini
- View AI chat history
- Manage extension storage in Application > Storage
- Performance improvements
- Interaction phases in live metrics
- Render blocking information in the Summary tab
- Support for scheduler.postTask events and their initiator arrows
- Animations panel and Elements > Styles tab improvements
- Jump from Elements > Styles to Animations
- Real-time updates in Computed tab
- Compute pressure emulation in Sensors
- JS objects with the same name grouped by source in the Memory panel
- A new look for settings
- Performance insights panel is deprecated and removed from DevTools
- Miscellaneous highlights
- Debug CSS with Gemini
- Control AI features in a dedicated settings tab
- Performance panel improvements
- Annotate and share performance findings
- Get performance insights right in the Performance panel
- Spot excessive layout shifts easier
- Spot the non-composited animations
- Hardware concurrency moves to Sensors
- Ignore anonymous scripts and focus on your code in stack traces
- Elements > Styles: Support for sideways-* writing modes for grid overlays and CSS-wide keywords
- Lighthouse audits for non-HTTP pages in timespan and snapshot modes
- Accessibility improvements
- Miscellaneous highlights
- Network panel improvements
- Network filters reimagined
- HAR exports now exclude sensitive data by default
- Elements panel improvements
- Autocomplete values for text-emphasis-* properties
- Scroll overflows marked with a badge
- Performance panel improvements
- Recommendations in live metrics
- Navigate breadcrumbs
- Memory panel improvements
- New 'Detached elements' profile
- Improved naming of plain JS objects
- Turn off dynamic theming
- Chrome Experiment: Process sharing
- Lighthouse 12.2.1
- Miscellaneous highlights
- Recorder supports export to Puppeteer for Firefox
- Performance panel improvements
- Live metrics observations
- Search requests in the Network track
- See stack traces of performance.mark and performance.measure calls
- Use test address data in the Autofill panel
- Elements panel improvements
- Force more states for specific elements
- Elements > Styles now autocompletes more grid properties
- Lighthouse 12.2.0
- Miscellaneous highlights
- Console insights by Gemini are going live in most European countries
- Performance panel updates
- Enhanced Network track
- Customize performance data with extensibility API
- Details in the Timings track
- Copy all listed requests in the Network panel