Monochromio: One-Click Grayscale for Websites by Pedro S.

Monochromio makes the web feel calmer by turning websites greyscale in one click. It removes distracting colours while you read, study, code or browse.

Use Monochromio for:

• Reading long articles
• Studying or coding
• Making social feeds less stimulating
• Calmer browsing during work sessions
• A simple black-and-white browsing experience

How it works:

1. Open Firefox's Extensions menu. Open the menu next to Monochromio and choose Pin to Toolbar.
2. Greyscale is on when you first install it. Open a website to try it. Existing users keep their saved setting when updating.
3. Click the Monochromio icon to switch between colour and greyscale across supported tabs.

The greyscale icon and ON badge mean greyscale is enabled. The colour icon and OFF badge mean websites keep their original colours. Your preference stays on your device and is remembered between browser sessions.

Why use Monochromio?

• One-click switching across supported tabs
• Applies to newly opened websites too
• No account or subscription
• Free to use
• No analytics, tracking or data collection

Firefox's internal pages, Firefox Add-ons and some protected pages keep their original colours. Monochromio works on supported HTTP and HTTPS websites where it has permission to run. Other extensions that change page colours or CSS filters may affect the result.