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Tomorrow Night Darkly - Firefox Theme

A dark browser theme for Firefox matching the Tomorrow Night Darkly palette used by the Chrome, GitHub, and Mattermost themes.

Install

  1. Open about:debugging in Firefox.
  2. Click This Firefox in the sidebar.
  3. Click Load Temporary Add-on....
  4. Select theme/manifest.json.

The theme is applied immediately and stays active until Firefox is closed -- this is the fastest way to preview or develop it. Temporary add-ons are removed when Firefox restarts.

For a permanent install, the theme must be signed and distributed through addons.mozilla.org (AMO); Firefox refuses to load unsigned themes permanently.

Color mapping

Setting Hex Palette role
Frame / toolbar field / new tab background #202020 primary gray
Toolbar / popup / new tab background #181818 darker gray
Toolbar text / new tab text / popup text #c6c6c6 light gray text
Toolbar field / popup border #2e2e2e border / hover surface
Tab text / tab line / tab loading indicator #b294bb accent purple
Bookmark text / popup highlight / icons attention #b294bb accent purple
Button background hover #2e2e2e border / hover surface
Popup highlight text #181818 darker gray (contrast on accent)

Foreground on accent surfaces (popup highlight) is #181818 for contrast.