# Global Grayscale

> Globally synced and Open Source grayscale for all tabs and UI.

Canonical page: [https://chrome-stats.com/d/global-grayscale](https://chrome-stats.com/d/global-grayscale)

## Overview

- **ID:** `global-grayscale`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Alexander M
- **Category:** appearance
- **Version:** 4.0
- **Last updated:** 2026-01-03
- **First published:** 2025-12-31
- **Size:** 24 KB
- **Data as of:** 2026-09-08
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/global-grayscale/)

## Description

Applies grayscale to all tabs. Can be toggled on and off by clicking the add-on icon.
Source: <a href="https://prod.outgoing.prod.webservices.mozgcp.net/v1/4a190ece5303aabd51c9fc78b92deaa20dfa212414414668ab196236d5062243/https%3A//github.com/adminchev/Grayscale-for-Firefox" rel="nofollow">https://github.com/adminchev/Grayscale-for-Firefox</a>

## Rankings

- #140,667 — Overall
- #33 — pdf grayscale

## Permissions and access

### Permissions

- `scripting`
- `theme`
- `storage`

### Content script matches

- `<all_urls>`

## Safety

- **Risk impact:** Moderate risk impact
- **Risk likelihood:** Moderate 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/global-grayscale)