https://github.com/psychosomat/washibird

A relaxed, soft theme for Thunderbird featuring neat pastel colours with a subtle cartoon effect.
https://github.com/psychosomat/washibird

css themes thunderbird

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A relaxed, soft theme for Thunderbird featuring neat pastel colours with a subtle cartoon effect.

• Host: GitHub
• URL: https://github.com/psychosomat/washibird
• Owner: psychosomat
• License: mit
• Created: 2026-04-13T15:10:41.000Z (3 months ago)
• Default Branch: master
• Last Pushed: 2026-06-04T08:18:04.000Z (about 1 month ago)
• Last Synced: 2026-06-04T10:09:20.836Z (about 1 month ago)
• Topics: css, themes, thunderbird
• Language: CSS
• Homepage:
• Size: 983 KB
• Stars: 8
• Watchers: 1
• Forks: 2
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • Funding: .github/FUNDING.yml
  • License: LICENSE

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README

          
# WashiBird

![Light Mode](preview/2.png)

## Thunderbird Theme

![License](https://img.shields.io/github/license/psychosomat/washibird?style=for-the-badge&labelColor=24283b&color=24283b)

![Thunderbird](https://img.shields.io/badge/Thunderbird-128+-24283b?style=for-the-badge&logo=thunderbird)

A relaxed, soft theme for Thunderbird featuring neat pastel colours with a subtle cartoon effect. The theme brings a modern, contemporary design to your email client while maintaining a clean and focused user experience.

## ✨ Features

- **Full UI Styling**: Complete theming for Inbox, Message View, Composer, Calendar, and Address Book

- **Theme Modes**: Light, Dark, and System (auto) mode toggle available in Add-on Preferences

- **Colored Blockquotes**: Beautifully styled blockquotes for Plain Text and Simple HTML views

- **Custom Typography**: Driven by Rubik, Overlock, and Chivo font tokens for a cohesive look

- **Privacy First**: No data collection, no external communication, styling only

## 📋 Compatibility

- **Thunderbird**: 128+

- **Manifest**: V2

- **Platforms**: Windows, macOS, Linux

## 🚀 Installation

### From XPI File

1. Set Thunderbird theme to **Default Light** or **Default Dark**

2. Download the `washibird-theme.xpi` file

3. Install the XPI file in Thunderbird (File → Install Add-on From File...)

4. Go to **Add-ons → WashiBird → Preferences** to select your preferred theme mode

### Building from Source

```bash

zip -r washibird-theme.xpi . -x ".git/*" ".github/*" ".gitignore" "preview/*" "biome.json" "AGENTS.md" "README.md" "LICENSE"

```

## 🔧 Permissions

The theme requires the following permissions:

- `messagesRead` - For styling message content

- `messagesModify` - For applying styles to messages

- `compose` - For theming the composer window

- `storage` - For storing theme preferences

- `tabs` - For styling tab elements

- `theme` - For applying the theme

**Privacy Note**: These permissions are used exclusively for UI styling. No data is collected, stored externally, or transmitted to any third-party services.

## 📸 Screenshots

![Dark Mode](preview/1.png)

![Light Mode](preview/2.png)

![Light Mode Calendar](preview/3.png)

![Light Mode Calendar](preview/4.png)