> ## Documentation Index
> Fetch the complete documentation index at: https://requestly-mintlify-changelog-requestly-past-week-38456.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Browser Extension 

> Learn how to use Browser Extention to intercept HTTP Request and Responses

**Requestly’s browser extension** is the simplest way to intercept and modify HTTP requests and responses directly **within your browser**. It’s lightweight, easy to install, and perfect for debugging frontend issues or simulating API responses—without needing to run a local proxy or configure complex setups.

Whether you're a frontend developer testing new **API integrations** or a QA engineer simulating error scenarios, the browser extension gives you powerful tools right in your development environment.

### Key benefits

* **No proxy setup required** – Works entirely within the browser.

* **Quick debugging** – Instantly view, rewrite, or mock API requests.

* **Cross-browser support** – Available for Chrome, Firefox, Edge, and more.

* **Secure and isolated** – Only affects traffic in the browser you install it on.

### When to use the browser extension

Use the browser extension if:

* You only need to intercept traffic from websites or web apps.

* You’re testing frontend behavior and want a quick setup.

* You want to create rules to mock APIs, rewrite URLs, inject scripts, or modify headers.

### How to intercept traffic using the extension

Once the browser extension is installed, you can start intercepting traffic with just a few clicks.

Follow the Browser Interception guide to get started →

This guide walks you through launching a connected browser, viewing traffic in the network table, and verifying the proxy setup.

[Req](/general/http-interceptor/desktop-app-interception)[uestly’s Browser Extension is a lightweight intercepto](/general/http-interceptor/browser-interception)r tha[t runs directly in your browser. It allows you to inte](/general/http-interceptor/browser-interception)rcept, modify, and control both incoming responses and outgoing requests, making it a powerful tool for developers and testers.

## **Browser extension features**

With the browser[ extension, you can:](/general/http-interceptor/desktop-app-interception)

* **Modify requests** – Change headers, query parameters, or request methods before they’re sent.

* [**Mock responses**](/general/api-mocking/api-mocking) – Return custom JSON or status codes instead of hitting the rea[l server.](/general/http-interceptor/desktop-app-interception)

* [**Redirect traffic** – Route](/general/http-interceptor/desktop-app-interception) API calls to staging or mock URLs for flexibl[e testing.](/general/http-interceptor/desktop-app-interception)

* [**Inject** ](/general/http-interceptor/desktop-app-interception)[**scripts/styles**](/general/http-rules/rule-types/insert-scripts) – Add custom JavaScript or CSS int[o pages on the fly.](/general/http-interceptor/desktop-app-interception)

Learn more about how to work with browser interceptor [here.](/general/http-interceptor/desktop-app-interception)

## [Supported Brow](/general/http-interceptor/desktop-app-interception)sers & Profiles

Requestly supports all modern browsers, and y[ou can use it with ma](/general/http-interceptor/desktop-app-interception)ny browsers li[ke Google Chrome, Fir](/general/http-interceptor/desktop-app-interception)efox, and Sa[fari. Here’s a breakd](/general/http-interceptor/desktop-app-interception)own of the browser support:

* **Chromium-Base**[**d Browsers**](/general/http-interceptor/desktop-app-interception)

  [Requestly](/general/http-interceptor/desktop-app-interception) is available on all Chrome-based brows[ers through the Chrom](/general/http-interceptor/desktop-app-interception)e Web Store. This includes Google Chrome, Microsoft Edge, Brave, Opera[, and others.](/general/http-interceptor/desktop-app-interception)

* [**Fire**](/general/http-interceptor/desktop-app-interception)**fox**

  We officially support Firefox and its variants, ensuring a seamless experience across different Firefox-based browsers.

* **Safari (API Client Only)**

  The Requestly extension is available for Safari, but currently, it only supports the API Client. Support for HTTP rules will be available soon.