WashiBird

Thunderbird Theme

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

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