What's new in DevTools, Chrome 139

Sofia Emelianova
Sofia Emelianova
GitHub

A more reliable and productive Chrome DevTools

In this version, Chrome DevTools prioritized product excellence. This involved tackling a wide array of known issues, from long-standing visual glitches, usability concerns, and inconsistencies in design to performance and functional issues. Overall, we reduced the number of open issues by 27%.

We finally addressed some years-old issues, but we also made improvements in newer features, for example, in the Performance panel and AI assistance. The result is a significantly improved developer experience across the board.

Behind the scenes, we undertook a massive effort to enhance our test coverage, investigated complex test failures, migrated tests to more robust foundations, and resolved bugs that we discovered along the way. We managed to reduce the number of test related issues by 54%.

We hope you will experience these numerous subtle fixes and refinements across various panels, making your daily debugging and development workflows smoother, more reliable, and more productive.

Upload images in AI assistance for styling

To provide additional visual context to your prompts, you can now not only take automatic screenshots but also upload arbitrary images to your chats with Gemini in the AI assistance panel.

Start your conversation from the Elements panel by selecting a DOM element and clicking Ask AI, so the element is specified as conversation context. Then click Add image in the input field.

The before and after supporting arbitrary image uploads.

Add request headers to the table in Network

In the Network panel, you can now right-click a column name in the requests table and select multiple request headers to add them as columns.

The before and after adding the 'request headers' option to the menu.

Chromium issue: 397481040.

Check out the highlights from Google I/O 2025

If you haven't yet, try the new major Chrome DevTools features highlighted on Google I/O 2025, including but not limited to:

Additionally, check out new Performance insights: Duplicated JavaScript and Legacy JavaScript.

Miscellaneous highlights

These are some of many notable fixes and improvements in this release:

  • Application: There's now a confirmation dialog to clear IndexedDB object stores because it's an irreversible action (crbug.com/326987147).
  • Sources: Logpoints and conditional breakpoint badges next to code lines now show a tooltip on hover with their corresponding log message or condition (crbug.com/40266230).

  • Performance:

    • The Layout shift culprits insight now shows links to unsized images (crbug.com/416449602).
    • The LCP request discovery insight now shows image load delay after earliest start point.
    • Throttling: Fixed the outdated format of throttling settings that some users had stored locally.
    • Event log: Filtering got a speed boost (crbug.com/40783421).

  • Animations: Deprecated preview screenshots because click-to-preview an animation group provides similar and better experience (crbug.com/330179643).

  • Accessibility:

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.

What's new in DevTools

A list of everything that has been covered in the What's new in DevTools series.