Debugging and refining UIs are critical parts of frontend development. More often than not, you’re fixing something: an incorrect margin, a row of cards that isn’t responsive, or a tricky UI error. Typically, this involves digging through developer tools or reading hundreds of lines of styling code to identify the exact issue, implementing a fix, and switching back to localhost to verify it. It’s a slow, tedious cycle.
What if you could update your UI code directly from the browser, or simply have your coding agent navigate your app and handle the task for you?
That’s what Kombai Browser enables. It’s an agentic browser that reduces context switching by letting you visually edit UIs and automate complex browser actions with simple chat inputs.
Edit UIs Precisely with the Kombai Browser Extension
The Kombai Browser has a pre-installed extension that lets you interact with your webpage and use the Agent directly inside the browser. It includes the element selection tools, styles editor, text editor, and a DOM selector.
Using these, you can attach DOM elements to chat as context, visually edit your project's CSS, live-edit any text on your site, and visually rearrange or delete DOM elements. Once you are done with your changes, send the final state to the Agent for code implementation.
It's a faster way to experiment with new designs, colors, layouts, and copy than manually updating code or using Chrome DevTools.
Attach DOM elements to context
Describing the exact location of a UI element in chat is tedious and context-inefficient. Instead of typing out long instructions like "the third card in the second row" or manually uploading screenshots, Kombai Browser lets you attach the DOM element itself directly to the chat.
To do this, you can use either the Element Selector or the Snipping Tool. While these tools are largely interchangeable, the Snipping Tool is particularly useful if you need to capture multiple elements that don’t share a common parent.
As soon as you select an element, it is attached to your current chat as context. When you send the next message, Kombai already knows which part of the DOM you are targeting, enabling faster and more accurate code generation.
Visually edit CSS styles
The Kombai Browser Extension features a visual style editor that lets you modify CSS properties directly on the live page. Rather than digging through Chrome DevTools or constantly switching back to your IDE to guess pixel values, you can update styles and see the results instantly.
The editor gives you control over every aspect of your design. You can visually adjust or add text styles, appearance, position, layout, background, border, shadows, and animations.
Unlike Chrome DevTools, these changes aren't just temporary previews. You can send the final state of your changes to the Agent for code implementation. Kombai identifies the relevant code in your repo and applies the updates for you, eliminating the need to hunt for the specific DOM element in your codebase or to manually describe CSS changes to the Agent.
Quick text editing for copy changes
Updating website copy can feel unnecessarily heavy. You typically have to hunt down the specific string in your codebase, or make temporary edits in Chrome DevTools that vanish the moment you reload the page.
Kombai simplifies this by letting you directly edit any text on the webpage and iterate without any fear of losing your work. Simply select the text editing tool, then click the exact element you want to make editable.
You can instantly see how your new content fits within the layout, helping you catch potential issues like text overflow or awkward line breaks.
It is also ideal for non-technical team members, like marketers, who can experiment with messaging in a real-world environment. Once you have found your best messaging, send it to the Agent, and Kombai applies the changes to the appropriate files in your project.
Use the built-in Resource Library for inspiration
Kombai Browser includes a built-in Resource Library containing top-tier design resources to help you build better frontends faster. This library gives you instant access to curated design inspiration, color palettes, fonts, animations, UI components, and assets ready to use in your project.
To use a resource, simply attach the specific DOM element or page link from the library directly to the chat. You can then prompt the Agent to implement that specific design into your codebase.
You can also combine selections from multiple tabs to craft unique, standout designs. For example, if you want to redesign a specific section of your website, you can select that section in one tab, pick a layout inspiration from the library in a second tab, and choose a color palette in a third.
Automate manual workflows with Kombai Browser
In addition to precise UI edits, Kombai can control the browser and automatically carry out tasks for you. It can navigate your application, interact with elements, and run complete workflows based on your instructions.
Instead of manually navigating through your app to verify behavior, you can have the agent operate the browser to identify and fix issues across user flows, design fidelity, and responsiveness.
Test and improve design fidelity
If you’ve built a UI based on a Figma design, you can use Kombai to test your localhost version against the original reference to catch inconsistencies in layout, typography, and styling.
Ask Kombai to compare your localhost directly against the original Figma design. It will navigate to your app in the browser and compare the rendered UI with the Figma design. It can identify even the minute differences and automatically update your code to make your UI closer to the original Figma design.
Test and improve UI functionality
Kombai can test your application directly on localhost, simulating how a real user would interact with it. It can click buttons, open dropdowns, move across routes, submit forms, and run through complete user flows to verify that everything behaves as expected.
If an interaction fails, Kombai identifies the exact issues using the available browser data and the corresponding code from your repo, and implements the necessary fix.
It saves you from manually testing your app's end-to-end functionality, so you can focus on other development tasks.
Automate responsiveness checks
Instead of manually checking your app on every device size, you can have Kombai test your site’s responsiveness for you. The Agent automatically resizes the browser to various dimensions to inspect how the UI handles different widths and identifies elements that don't scale as intended.
When a responsiveness issue is found, Kombai determines whether the fix requires a new media query or an adjustment to existing CSS properties. It then applies these updates directly to your styles.
If you’re already aware of a problem at a specific breakpoint, you can ask Kombai to visit the site at that exact dimension. Kombai will examine the layout, determine the cause of the issue, and implement the required fix directly in your codebase.
Review and improve the design
Kombai includes a "Review Design" skill that reviews your application for UI and UX improvements. When you use this skill, the Agent navigates through your app to find design inconsistencies or areas where the interface feels unpolished.
The Agent analyzes your app in the browser and generates a report listing suggested improvements to enhance the user experience. You can also specify which aspects of the design you want reviewed, like accessibility, responsiveness, or mobile usability, and the feedback will be focused on those areas.
Once you’ve reviewed the generated design report, ask Kombai to implement the improvements. The Agent applies the changes to the relevant components and styles in your codebase, ensuring the final UI is consistent and polished.
Conclusion
Kombai Browser is designed to automate the most repetitive and time-consuming aspects of frontend development. It frees you from manually handling UI refinements and minor fixes, allowing you to focus on building high-impact features and core application logic.
Put Kombai Browser to work whenever you need to resolve UI issues or make refinements. To learn more about Kombai Browser, read the linked guide, or feel free to reach out to our support channels for further help.