# Tinker Tester Developer Spy

> Handy diagnosis tools for figuring out how web sites work

Canonical page: [https://chrome-stats.com/d/tinker-tester-developer-spy](https://chrome-stats.com/d/tinker-tester-developer-spy)

## Overview

- **ID:** `tinker-tester-developer-spy`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Thomas Wisniewski
- **Category:** web-development,other
- **Daily users:** 2
- **Rating:** 4.60 / 5 (15 ratings)
- **Version:** 1.1.7resigned1
- **Last updated:** 2024-04-25
- **First published:** 2018-06-27
- **Size:** 48 KB
- **Data as of:** 2026-09-06
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/tinker-tester-developer-spy/)
- **Website:** [https://github.com/webcompat/tinker-tester-developer-spy](https://github.com/webcompat/tinker-tester-developer-spy)

## Description

Tinker Tester Developer Spy is a Firefox add-on that provides specialized breakpoints, stack tracing, and debugging tools to diagnose and understand website functionality. It also offers features like remapping network requests, overriding HTTP headers, and spoofing geolocation and language settings.

## Rankings

- #58,150 — Overall
- #191 — developer tools
- #248 — ad spy

## Permissions and access

### Permissions

- `<all_urls>`
- `tabs`
- `webRequest`
- `webRequestBlocking`

## 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).

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Source: [Chrome-Stats](https://chrome-stats.com/d/tinker-tester-developer-spy)