# FiddlerFox

> Allows you to point Firefox to your fiddler instance if it doesn't refresh the proxy settings after Fiddler has started.

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

## Overview

- **ID:** `fiddlerfox`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Sebastiaan Dammann
- **Category:** web-development,other
- **Daily users:** 346
- **Weekly downloads:** 3
- **Rating:** 4.90 / 5 (10 ratings)
- **Version:** 1.0
- **Last updated:** 2021-04-09
- **First published:** 2017-10-18
- **Size:** 12 KB
- **Data as of:** 2026-09-16
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/fiddlerfox/)
- **Website:** [https://github.com/Sebazzz/fiddlerfox](https://github.com/Sebazzz/fiddlerfox)

## Description

**FiddlerFox** is a Firefox extension designed to simplify the use of the Fiddler proxy during web development. Normally, Firefox loads proxy settings only once upon startup and ignores subsequent OS proxy changes. This means if you start Fiddler after Firefox, the browser won’t automatically route traffic through Fiddler.

FiddlerFox solves this by adding a toolbar button that lets you manually toggle the connection to your local Fiddler instance (default port 8888) without restarting Firefox or navigating complex proxy menus. This is especially useful during active development sessions with multiple tabs and windows open.

Unlike the legacy FiddlerHook extension, which is unsigned and incompatible with newer Firefox versions, FiddlerFox is up-to-date and officially available via Mozilla Add-ons, providing a seamless and user-friendly solution for integrating Fiddler proxy with Firefox.

## Rankings

- #6,224 — Overall
- #75 — foe
- #190 — settings
- #206 — problem
- #222 — finder
- #223 — refresh

## Permissions and access

### Permissions

- `proxy`
- `*://*/*`
- `webRequest`
- `storage`

## Safety

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

### Analysis details

- Allows access to all websites, posing a significant security risk as it can monitor and modify data from any visited site.
- 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).

## Review summary

Users appreciate FiddlerFox for its useful tools that simplify configuring Fiddler, enabling quick setup with just a button press. However, a notable issue mentioned is that it no longer intercepts traffic to localhost, limiting its functionality in local development environments.

### Pros

- Provides useful tooling that saves time and effort.
- Allows direct configuration of Fiddler with a simple button press.

### Cons

- No longer intercepts traffic to localhost.

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