# Network Interceptor

> Intercept, mock, redirect, block, delay, and modify network requests — no proxy or backend changes needed.

Canonical page: [https://chrome-stats.com/d/network-interceptor](https://chrome-stats.com/d/network-interceptor)

## Overview

- **ID:** `network-interceptor`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Dheeraj Kumar
- **Category:** web-development
- **Daily users:** 7
- **Weekly downloads:** 2
- **Version:** 1.0.0
- **Last updated:** 2026-05-04
- **First published:** 2026-05-01
- **Size:** 31 KB
- **Data as of:** 2026-09-16
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/network-interceptor/)

## Description

Network Interceptor gives developers full control over network requests
  directly in the browser. Set up rules to mock, redirect, block, delay,
  or modify requests — without touching your backend or configuring a proxy.

── RULE TYPES ──────────────────────────────────────────                                                                                                                                   

<code>Mock          Return a custom response body and status code for any                                                                                                                      
              fetch or XHR request.

Redirect      Transparently forward a request to a different URL,
              preserving the original method and headers.

Block         Cancel matching requests outright.

Delay         Slow down requests by a configurable number of
              milliseconds to simulate latency.

Modify Headers  Add, set, or remove request and response headers
                on matching requests.

Modify Query Params  Add, replace, or remove URL query parameters
                     without editing your source code.

Redirect JS   Serve a local or alternate script in place of a
              remote JavaScript file.
</code>

── MATCHING OPTIONS ────────────────────────────────────

<code>Match URLs by exact string, contains, wildcard (*), or full regex.
Filter by HTTP method (GET, POST, PUT, DELETE, etc.) or match any.
</code>

── HOW IT WORKS ────────────────────────────────────────

<code>Rules are applied in real time — no page reload required after
toggling. A subtle on-page toast shows which rules fired and
against which URL, so you always know what was intercepted.
</code>

── USE CASES ───────────────────────────────────────────

<code>• Mock API responses during frontend development
• Test error states (404, 500) without backend support
• Simulate slow network conditions
• Override feature flags or A/B test payloads
• Strip or inject authentication headers
• Redirect production API calls to a local dev server
</code>

No external servers. No data leaves your browser.

## Rankings

- #39,728 — Overall
- #27 — network

## Permissions and access

### Permissions

- `storage`
- `tabs`
- `declarativeNetRequest`

### Host permissions

- `<all_urls>`

### Content script matches

- `<all_urls>`

## Safety

- **Risk impact:** High risk impact
- **Risk likelihood:** High 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 has low user count. Unpopular extensions 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).

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