London Theme for Firefox

The premium Codigrate London theme for Firefox. Add it to your cart, pay once, download it right away; install steps included.

Inspired by London at dusk, this dark theme rests on a slate grey base washed with twilight indigo, then lights it with the pillar box red of a K6 telephone box and the muted steel blue of the Thames. The calm grey surface keeps long sessions easy on the eyes while the red accents mark what matters.

A dark theme from the Codigrate Cities collection, released 2026-08-25. Tags: Royal, Atmospheric, Steel.

Sold on codigrate.com for .99, one payment, tax included: add it to your cart, pay with Stripe (cards, Apple Pay, Google Pay), and download the theme right away. No account needed. Personal licence; a digital download, so all sales are final (see the terms of sale).

London theme for Firefox, a screenshot

Getting started on Firefox

  1. Open the theme's Firefox Add-ons page with the Go to store button.
  2. Click Add to Firefox and confirm in the prompt that opens.
  3. The theme applies at once: the tabs, the toolbar and the address bar take its colors, no restart.
  4. Want another look later? Open Add-ons and themes ( Cmd+Shift+A on a Mac, Ctrl+Shift+A on Windows and Linux ) → Themes and enable another theme; switch back the same way any time.

London color palette

Every named color of the London palette, free to download for MacOS, CorelDRAW and Figma.

London on every platform

Codigrate

Codigrate