# spymastermatt/thunderbird-monterail

A set of themes for thunderbird inspired by a Monterail blog post

Repository: https://github.com/spymastermatt/thunderbird-monterail
Canonical: https://ross.abutalabs.com/products/thunderbird-monterail
Language: CSS
License: GPL-3.0
License Family: copyleft
Topics: thunderbird, theme
Last push: 2020-05-18T06:09:47+00:00

## Health v2 (maintenance only)
Score: 32/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 0, release rhythm 35, longevity 100
- inputs: {"age_days": 3416, "days_push": 2298, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1049, forks 74 (observed 2026-08-28T04:03:22.608697+00:00)

## What it is
A set of userChrome.css themes for Mozilla Thunderbird inspired by the Monterail email client redesign mockups. It includes five color variants, a bundled font, and replacement SVG icons.

## Use cases
- make thunderbird look modern and minimal
- apply a dark theme to thunderbird
- customize thunderbird colors and fonts
- replace thunderbird's default icons
- match thunderbird's appearance to my system theme

## When to choose
- you want a polished, modern visual restyle of Thunderbird
- you prefer dark or system-matching color schemes in your email client
- you are comfortable editing CSS variables to customize colors and fonts

## When to avoid
- you need a theme compatible with the latest Thunderbird versions, as the project has not been updated since 2020
- you want a one-click installable add-on rather than manually extracting files into your profile's chrome folder
- you use a Thunderbird version where userChrome.css customization is disabled by default

## Facets
- artifact type: plugin
- maturity: maintenance
- function: theme
- domain: email, desktop-applications, web-design
- platform: cross-platform
- tags: thunderbird, userchrome-css, email-client-theming, css-themes, svg-icons

## Member repositories
- spymastermatt/thunderbird-monterail (main) score 32

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:03:22.608697+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T07:00:33.688103+00:00, confidence not recorded.
  - readme: https://github.com/spymastermatt/thunderbird-monterail (fetched 2026-08-28T04:03:22.608697+00:00, sha db869a76ba6d)
- Data as of 2026-08-30T08:39:29.467469+00:00.