# Arsenic UI (Full Black)

> A sleek, full-black Firefox theme (true black UI, OLED-friendly, open-source).

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

## Overview

- **ID:** `arsenic-ui`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Arsenic
- **Category:** solid
- **Daily users:** 12
- **Weekly downloads:** 1
- **Rating:** 5.00 / 5 (1 ratings)
- **Version:** 1.2
- **Last updated:** 2025-09-03
- **First published:** 2025-09-01
- **Size:** 7.64 KB
- **Data as of:** 2026-09-07
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/arsenic-ui/)
- **Website:** [https://arsenobetaine.dev](https://arsenobetaine.dev/)

## Description

<strong>Arsenic</strong> is a true-black, full UI theme for Firefox created by <a href="https://prod.outgoing.prod.webservices.mozgcp.net/v1/ee77750d9be8162c459f52ea6c41ee92d0de4ab1d8f0f1dc82c7b3428aee163d/https%3A//github.com/arsenobetaine" rel="nofollow">arsenobetaine</a>.
Designed for minimalism and maximum contrast, Arsenic makes toolbars, tabs and menus pure black (#000) for a sleek look and better battery/eye comfort on OLED displays.

Highlights
<ul><li>True black UI across browser chrome (tabs, toolbar, menus)  </li><li>OLED-friendly and great for low-light setups  </li><li>Open source — code &amp; issues: <a href="https://prod.outgoing.prod.webservices.mozgcp.net/v1/4812590c8f6d0c7d8cee03e88aceafd45d6b143ced7557806d21e783a4fe6b68/https%3A//github.com/arsenobetaine/arsenic" rel="nofollow">https://github.com/arsenobetaine/arsenic</a>  </li><li>License: Creative Commons Attribution 4.0.  </li></ul>
Enjoy — and if you like it, a star on GitHub or a review on AMO helps a lot!

## Rankings

- #30,634 — Overall
- #101 — fullhd

## Safety

- **Risk impact:** Very low risk impact
- **Risk likelihood:** Moderate 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/arsenic-ui)