Support Dia browser for /chrome (claude-in-chrome)

Feature Request

Add Dia browser support for the /chrome (claude-in-chrome) browser automation feature.

Context

Dia is a Chromium-based browser that supports Chrome extensions. The Claude extension (fcoeoabgfenejglbffodgkkbkcdhcgfn) installs and runs correctly in Dia — the Claude Browser Extension sidebar works fine, confirming Native Messaging is functional.

However, Claude Code's switch_browser does not detect Dia as an available browser, even after manually copying the Native Messaging Host config to Dia's Application Support directory.

Details

• Dia's bundle identifier: company.thebrowser.dia
• Dia's Application Support path: ~/Library/Application Support/Dia/
• Dia's User Data path: ~/Library/Application Support/Dia/User Data/
• Chrome extension works in Dia: Yes (Claude Browser Extension sidebar is fully functional)
• Native Messaging Host files copied to both paths: Still not detected by switch_browser

Currently supported browsers

Based on the Native Messaging Host registration, Claude Code currently supports:

• Google Chrome
• Chromium
• Microsoft Edge
• Arc
• Vivaldi
• Brave
• Opera

Expected behavior

Dia should be recognized as a valid browser target for /chrome, similar to how Arc (another non-standard Chromium browser) is supported.

Environment

• macOS
• Dia browser (Chromium-based, dia:// protocol)
• Claude Code CLI