Grayscale Bro

Name: Grayscale Bro
Rating: 4.5 (12 reviews)
Author: xpmn

By: xpmn

A minimal Firefox extension for monochrome browsing. Supports dark theme and grayscale only on selected hostnames. [Notice: Doesn't work at mozilla pages]

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Features & Capabilities

Grayscale Bro is a minimal Firefox extension designed for users who prefer a monochrome browsing experience. It provides support for a dark theme and allows applying grayscale only on selected hostnames, enhancing focus and reducing color distractions. The extension leverages experimental features to deliver this functionality, though it may have some issues with pages that use position:fixed elements.

Please note that Grayscale Bro does not work on Mozilla pages. As an open-source project, the source code is available on GitHub for users interested in contributing or reviewing the code. This extension is ideal for users seeking a simple yet powerful tool to experience websites in grayscale with optional dark mode enhancements.

User Growth & Download Statistics

Add-on Accessibility Open Source

By:

xpmn

Daily users:

571 -9

Rating:

4.50

(12)

Version:

0.6.2 Last updated: 2024-02-02

Version code:

5686684

Creation date:

2020-06-21

Risk:

Permissions:

Content scripts matches:

<all_urls>

Size:

17.66KB

URLs:

Website

Full description:

Source:

Firefox Add-ons Store

Data ingested on:

2026-06-19

Compare stats and ranking:

Ranking

# 4,542 ▼ 38

Other rankings

#244 in Feeds, News & Blogging ▼ 1#4 in pdf grayscale keyword 9

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:

xpmn

Firefox Add-ons Store

https://addons.mozilla.org/firefox/addon/grayscale-bro/

Website:

https://github.com/xpmn/firefox-grayscale

User Reviews

Grayscale Bro is praised for effectively applying grayscale mode and allowing selective site control, providing a mostly smooth user experience. However, users frequently report problems with fullscreen videos and standalone images, including black screens and partial image visibility. Some also note color conversion inaccuracies on certain pages, suggesting improvements in grayscale processing would benefit the add-on.

Pros

Effectively converts web pages to grayscale as intended.
Allows users to enable grayscale mode on selected websites only.
User-friendly and works well across most websites.
Good control features for managing grayscale application.

Cons

Issues with fullscreen videos or images showing a black screen while audio continues.
Problem with images displayed alone where only the bottom half is visible, top half scrolls off-screen.
Color conversion inaccuracies leading to unexpected color changes instead of proper grayscale on some pages.

Recent reviews

by Cr*****, 2025-09-08

Tried a couple different greyscale extensions, but this is the one. Perfect.

by mi*****, 2025-01-16

by Fi*****, 2024-10-15

View all user reviews ›

Is Grayscale Bro 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.

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

Risk impact analysis details

Critical Grants access to browser tabs, which can be used to track user browsing habits and history, presenting a privacy concern.
Critical ****** ****** ** *** ********* ****** * *********** ******** **** ** ** *** ******* *** ****** **** **** *** ******* *****
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.

Grayscale Bro 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.
Low **** ********* *** ******* **** **** * ****** **** ***** ******** *** **** ****** ** ** ****** *** *****
Low **** ********* *** ***** **** **** * ****** **** ***** ********** *** **** ****** ** ** ****** *** *****
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