# tweak: mock and modify HTTP requests

> tweak allows you to mock and modify HTTP requests without leaving the browser

Canonical page: [https://chrome-stats.com/d/tweak-extension](https://chrome-stats.com/d/tweak-extension)

## Overview

- **ID:** `tweak-extension`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** tweak
- **Category:** web-development
- **Daily users:** 1,509
- **Weekly downloads:** 46
- **Rating:** 4.14 / 5 (28 ratings)
- **Version:** 8.7.2
- **Last updated:** 2026-09-01
- **First published:** 2020-06-27
- **Size:** 434 KB
- **Data as of:** 2026-09-09
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/tweak-extension/)
- **Website:** [https://tweak-extension.com/](https://tweak-extension.com/)
- **Privacy policy:** [https://addons.mozilla.org/firefox/addon/tweak-extension/privacy/](https://addons.mozilla.org/firefox/addon/tweak-extension/privacy/)

## Description

Tweak is a powerful Chrome extension that allows developers to mock and modify HTTP requests without leaving the browser. You can easily intercept requests to change response data, headers, status codes, and request payloads. It supports delaying individual requests and organizing configurations via export/import features.

Premium features include custom JavaScript to modify responses, bulk rule changes with global variables, random data generators for mock data, and tools like breakpoints and logpoints for debugging. Note that redirecting requests or replacing webpage documents like HTML or images is not supported. Tweak streamlines web development by enabling flexible HTTP request manipulation all within your browser.

## Rankings

- #2,608 — Overall
- #295 — Web Development
- #2 — mock
- #3 — modify
- #10 — request
- #14 — changelog

## Permissions and access

### Permissions

- `storage`
- `unlimitedStorage`
- `tabs`

### Content script matches

- `*`

## Safety

- **Risk impact:** High risk impact
- **Risk likelihood:** Moderate risk likelihood

### Analysis details

- Grants access to browser tabs, which can be used to track user browsing habits and history, presenting a privacy concern.
- This extension was recently updated in the past month. New updates may not be stable or safe.

> Some risk analysis details are omitted from this free response. [Upgrade to view the full analysis](https://chrome-stats.com/pricing).

## Review summary

Users praise the add-on for its ease of use, effective mocking features, and time-saving capabilities in development and debugging tasks. However, multiple reviews highlight significant issues with reliability and compatibility on Firefox, including failure to intercept requests, outdated versions, and occasional glitches. While the interface is generally well-liked, some functional limitations and confusing UI behaviors are noted. Overall, the tool is appreciated when it works, but many encounter frustrating inconsistencies and lack of updates specifically for Firefox support.

### Pros

- Easy to use with setup and mocking achievable in a few minutes
- Has saved significant development time by enabling request interception and mocking
- Provides all necessary features like intercepting requests and replacing with mock responses
- Nice-looking UI that users find appealing and practical
- Effective for debugging by allowing custom status codes and error messages

### Cons

- Frequently unreliable or non-functional in Firefox, with many users reporting failure to intercept API calls
- Extension seems outdated and incompatible with recent Firefox versions, causing errors and unexpected behavior
- Limited capability, such as inability to mock more than one API at a time
- Confusing UI elements like disappearing popups which may hinder usability
- Some users experience delays and errors instead of expected mocked responses

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Source: [Chrome-Stats](https://chrome-stats.com/d/tweak-extension)