UltimaDark - The Fastest Dark Mode Extension

Name: UltimaDark - The Fastest Dark Mode Extension
Rating: 4.4271 (96 reviews)
Author: ThomazPom

UltimaDark uses agressive and smart techniques to turn even the sunniest websites into realms of darkness. Although it works well, this is so experimental, it makes lab rats look like seasoned professionals. Go ahead, embrace the shadows! 🦇

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Features & Capabilities

UltimaDark is a high-performance Chrome extension that uses aggressive and intelligent techniques to convert even the brightest websites into dark, readable themes. It applies smart color transformations, selective image handling, and contrast adjustments to preserve visual clarity while minimizing glare. Built for speed, UltimaDark aims to load quickly and keep CPU impact low so night browsing stays smooth.

Experimental by nature, UltimaDark includes per-site controls, whitelist/blacklist options, keyboard shortcuts, and theme presets. Advanced settings let you tweak inversion strength, protect images and logos, or enable selective filters for better compatibility. Embrace the shadows and transform sunny websites into comfortable, distraction-free dark experiences.

User Growth & Download Statistics

Add-on Accessibility Design

By:

Daily users:

Rating:

Version:

1.6.66 Last updated: 2026-03-22

Version code:

6191719

Creation date:

2020-05-27

Risk:

Permissions:

Size:

3.39MB

URLs:

Website

Source:

Firefox Add-ons Store

Data ingested on:

2026-06-19

Compare stats and ranking:

Ranking

# 1,713 ▼ 7

Other rankings

#267 in Appearance

#2 in fastest way keyword 50

#26 in radar keyword 9 ▲ 1

#34 in dark mode keyword 78

#39 in fast vpn keyword 47 ▼ 1

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For Developers

Monetize with App Pass Boost with Extension Booster

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:

ThomazPom

Firefox Add-ons Store

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

Website:

https://github.com/ThomazPom/Moz-Ext-UltimaDark

Permission Change History

2025-08-16: Version 1.6.17 → 1.6.20

Remove Permissions: tabHide

2025-08-06: Version 1.6.12 → 1.6.13

Add Permissions: tabHide

User Reviews

UltimaDark is fast and lightweight with easy per-site exclusions and a modern UI, performing well across many sites and even benefiting OLED users. However, reliability varies on some sites (garbling or slow loading), and update-related bugs and settings loss are common. Platform compatibility issues (notably on Android) and occasional breakages after updates also affect consistency.

Pros

Very fast and efficient; significantly faster than Dark Reader with low performance impact.
Easy per-site exclusions and adjustable darkness settings.
Works well across many sites and handles progressively loaded content better.
Lightweight with a modern, user-friendly UI that simplifies setup.
Works better for OLED displays (great for OLED users).

Cons

Some websites render poorly or fail to load (e.g., YouTube loading issues, IMDb garbled on Android, white-on-white text on certain pages).

Recent reviews

by VO*****, 2026-06-02

it is a pretty decent addon, it would make some random things dark? and also pretty glitchy but overall very good,this is a nice alt to dark reader

by Fi*****, 2026-05-15

Breaks css of some websites, a.o. the brave search page

by mk*****, 2026-05-07

View all user reviews ›

Is UltimaDark - The Fastest Dark Mode Extension 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.

UltimaDark - The Fastest Dark Mode Extension 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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High ****** ********* ** * ****** ******** ******** ********** * ******* ******* *****

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.

UltimaDark - The Fastest Dark Mode Extension is probably trust-worthy. Prefer other publishers if available. Exercise caution when installing this add-on.

Risk likelihood analysis details

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