Etna Theme for Firefox

Inspired by Mount Etna's nighttime eruptions, this dark theme builds on an ashen basalt grey base and layers in the incandescent reds, oranges, and golds of molten lava. The near-neutral charcoal surface keeps long sessions calm, while the warm lava accents draw the eye to what matters.

A dark theme from the Codigrate Nature collection, released 2026-06-28. Tags: Ember, Earthy, Cinematic.

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).

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.

Etna color palette

• #222121
• #D74C57
• #C66439
• #E2BF79
• #D5CFCF

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

Etna on every platform

• Etna for JetBrains
• Etna for Xcode ($2.99)
• Etna for Zed (.99)
• Etna for Firefox (.99), this page
• Etna for Sublime Text (.99)
• Etna for MacOS Terminal (.99)
• Etna for iTerm2 (.99)
• Etna for Ghostty (.99)
• Etna for Rhino (.99)
• Etna for Slack ($0.99)
• Etna for Line

From the blog

• Value: How Colors Get Vivid: Value is the V in HSV, the brightness dial that tops out at the pure color, not white. How it differs from lightness, and why designers reach for it.