Tab Tint от Dhruv Anand

When several tabs come from the same site, their identical favicons make the tab strip hard to scan. Tab Tint lets you number or recolor the existing logo, enter a custom letter, or replace it with a solid marker.

• Add auto-incrementing, per-site number badges to the existing logo.
• Add a high-contrast color frame while keeping the logo visible.
• Enter a custom letter or pick markers with the mouse or number keys 1–6.
• Restore the site's original favicon at any time.
• No background process and no all-sites access.

The marker is intentionally temporary: reloading or navigating the tab restores the page's own favicon.