FiddlerFox

Name: FiddlerFox
Rating: 4.9 (10 reviews)
Author: Sebastiaan Dammann

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

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Install

Features & Capabilities

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.

User Growth & Download Statistics

Add-on Developer Tools Programming

By:

Daily users:

Rating:

Version:

1.0 Last updated: 2021-04-09

Version code:

5213475

Creation date:

2017-10-18

Risk:

Permissions:

Size:

11.57KB

Email:

fi*****@damsteen.nl

URLs:

Website

Full description:

Source:

Firefox Add-ons Store

Data ingested on:

2026-06-21

Compare stats and ranking:

Ranking

# 5,668 ▲ 19

Other rankings

#70 in foe keyword 20 ▲ 1

#186 in settings keyword 38 ▲ 1

#190 in finder keyword 44

#201 in problem keyword 9

#201 in refresh keyword 72 ▲ 2

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For Developers

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Contact the developer

Chrome-Stats does not own this Firefox add-on. Please use these information below to contact the Firefox add-on developer.

Developed by:

Sebastiaan Dammann

Firefox Add-ons Store

https://addons.mozilla.org/firefox/addon/fiddlerfox/

Email:

fi*****@damsteen.nl

Website:

https://github.com/Sebazzz/fiddlerfox

User Reviews

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.

Recent reviews

No longer intercepts traffic to localhost

by Sl*****, 2025-04-04

by 远离*****, 2025-03-26

by 远离*****, 2025-02-21

View all user reviews ›

Is FiddlerFox Safe?

Risk impact

Risk impact measures the level of extra permissions an extension has access to. A low risk impact extension cannot do much harms, whereas a high risk impact extension can do a lot of damage like stealing your password, bypassing your security settings, and accessing your personal data. High risk impact extensions are not necessarily malicious. However, if they do turn malicious, they can be very harmful.

FiddlerFox requires some sensitive permissions that could impact your browser and data security. Exercise caution before installing.

Risk impact analysis details

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

Risk likelihood measures the probability that a Firefox add-on may turn malicious. This is determined by the publisher and the Firefox add-on reputation on Firefox Add-ons Store, the amount of time the Firefox add-on has been around, and other signals about the Firefox add-on. Our algorithms are not perfect, and are subject to change as we discover new ways to detect malicious extensions. We recommend that you always exercise caution when installing a Firefox add-on.

FiddlerFox has earned a fairly good reputation and likely can be trusted.

Risk likelihood analysis details

High This extension has low user count. Unpopular extensions may not be stable or safe.
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