Claude in Chrome extension fails to connect on macOS (Chrome 146.0)

Claude in Chrome Extension - Browser Extension Not Connected

Summary

Claude in Chrome extension is installed and enabled but fails to connect to Claude Code CLI. The connection error persists despite multiple reinstallation attempts and environment reconfigurations.

Environment Information

• OS: macOS 25.3.0 (Darwin)
• Machine: MacBook-Pro-Volodymyr
• Node.js: v25.7.0
• npm: 11.10.1
• Chrome: Version 146.0.7680.80
• Claude Code: Latest (updated via npm update -g @anthropic-ai/claude-code)
• Claude Extension: Version 1.0.63 (Claude in Chrome - Beta)

Extension Details

• Extension ID: fcoeoabgfenejglbffodgkkbkcdhcgfn
• Status: Installed and Enabled ✓
• Native Host: Running ✓
• Service Worker: Available for inspection

Reproduction Steps

1. Installed Claude extension from https://claude.ai/chrome
2. Verified extension is enabled in chrome://extensions/
3. Confirmed user is logged into claude.ai (Account: Boba, Organization: Iris)
4. Attempted to connect via Claude Code CLI
5. Received error: "Browser extension is not connected"

Attempted Solutions (All Failed)

1. ✗ Extension restart/update
2. ✗ Chrome restart (multiple times)
3. ✗ Claude Code update (npm update -g @anthropic-ai/claude-code)
4. ✗ Complete extension reinstallation (removed + clean install)
5. ✗ Chrome cache clearing
6. ✗ Multiple browser restart cycles
7. ✗ Verified proper user authentication in browser
8. ✗ Confirmed native host processes are running

Diagnostic Information

Native Host Status

/Applications/Claude.app/Contents/Helpers/chrome-native-host chrome-extension://fcoeoabgfenejglbffodgkkbkcdhcgfn/

Status: Running (multiple instances detected)

Extension Status in chrome://extensions/

• Installed: Yes
• Enabled: Yes (toggle ON)
• Manifest: v3
• Permissions: Granted

Browser Authentication

• URL: https://claude.ai/new
• Logged In: Yes (user: Boba)
• Organization: Iris (Team plan)

Error Messages

Browser extension is not connected. Please ensure the Claude browser extension is installed and running (https://claude.ai/chrome), and that you are logged into claude.ai with the same account as Claude Code. If this is your first time connecting to Chrome, you may need to restart Chrome for the installation to take effect. If you continue to experience issues, please report a bug: https://github.com/anthropics/claude-code/issues/new?labels=bug,claude-in-chrome

Expected Behavior

• Claude Code CLI should detect the installed and enabled extension
• Browser extension should establish connection with Claude Code
• User should be able to interact with the browser via Claude Code

Actual Behavior

• Extension remains disconnected despite meeting all stated requirements
• Connection fails consistently across multiple installation attempts
• Native host is operational but connection doesn't establish

Additional Notes

• No error messages in the extension itself
• Service worker can be inspected without issues
• Native host processes are running correctly
• User authentication in browser is confirmed
• All required daemons and processes appear to be running

System Commands Output

ps aux | grep "chrome-native-host"
# Results:
# /Applications/Claude.app/Contents/Helpers/chrome-native-host chrome-extension://fcoeoabgfenejglbffodgkkbkcdhcgfn/ (2 instances running)

ps aux | grep -i chrome
# Results: Chrome browser running with multiple renderer and GPU processes

Related Issues

This appears to be similar to existing issues:

• Issue #21371: Extension not connecting despite being installed and enabled
• Issue #24593: Browser extension persistently fails to connect from CLI
• Issue #31971: Not connected despite correct setup (macOS + Chrome 145)

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Report submitted: March 23, 2026
Submitted by: wolf@MacBook-Pro-Volodymyr