# Black Fox

> A theme with a dark color scheme that fully modifies the appearance of Firefox browser far beyond the built-in customization features

Canonical page: [https://chrome-stats.com/d/black-fox-theme](https://chrome-stats.com/d/black-fox-theme)

## Overview

- **ID:** `black-fox-theme`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Serhiy Guryev
- **Category:** firefox
- **Daily users:** 10
- **Weekly downloads:** 1
- **Rating:** 5.00 / 5 (4 ratings)
- **Version:** 0.8
- **Last updated:** 2024-03-25
- **First published:** 2024-01-15
- **Size:** 9.38 KB
- **Data as of:** 2026-09-06
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/black-fox-theme/)
- **Website:** [https://github.com/serhiyguryev/black-fox-theme](https://github.com/serhiyguryev/black-fox-theme)

## Description

Firefox’s user interface is built of web-like elements (HTML and XUL elements) and styled using CSS. Thus, there are additional options for changing the appearance (user interface) of Firefox browser by applying style rules with an optional files named userChrome.css and userContent.css. With these files, the Black Fox theme's color scheme is applied to all elements of the Firefox interface, including: internal pages (all about: pages), dialog windows, error pages, infobars, developer tools etc.

Download and installation instructions (GitHub repository): <a href="https://prod.outgoing.prod.webservices.mozgcp.net/v1/1edce5a761774286c6eea2610db39990d06696855d37329a3bcd7a3440902f29/https%3A//github.com/serhiyguryev/black-fox-theme" rel="nofollow">https://github.com/serhiyguryev/black-fox-theme</a>

<b>Attention</b>: since the changes are mainly made in userChrome.css and userContent.css files, which are not updated automatically with the theme, you should check the theme's GitHub repository from time to time for updated versions of these files.

## Rankings

- #32,851 — Overall

## Safety

- **Risk impact:** Very low risk impact
- **Risk likelihood:** Low risk likelihood

### Analysis details

- This permission has no access or impact on the user's system or data, thus carrying no risk.
- 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/black-fox-theme)