[BUG] Claude in Chrome v1.0.63 - Extension not connecting to Claude Code after March 20 update

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

Bug Description

After the Chrome extension updated to v1.0.63 on March 20, 2026,
the extension can no longer connect to Claude Code.

Error Message

"Claude in Chrome is not connected - The Chrome extension isn't
reachable."

Steps to Reproduce

1. Update Claude in Chrome extension to v1.0.63 (March 20 update)
2. Open Claude Code in terminal
3. Try to use any browser automation tool
4. Connection fails immediately

Environment

• Claude in Chrome extension: v1.0.63 (updated March 20, 2026)
• OS: macOS
• Chrome: latest
• Claude Code: latest

What I've Tried

• Extension is enabled ✓
• Logged in with same account as Claude Code ✓
• Site access set to "On all sites" ✓
• Restarted Chrome ✓
• Extension is pinned to toolbar ✓
• Everything was working fine before the March 20 update

Expected Behavior

Extension connects to Claude Code and allows browser automation.

Actual Behavior

Connection always fails. The reconnect dialog appears but
reconnecting does not help.

What Should Happen?

fix it

Error Messages/Logs

Steps to Reproduce

1. Install Claude in Chrome extension v1.0.63 (updated March 20, 2026)
2. Open Claude Code in terminal and start a conversation
3. In Claude Code, attempt any browser tool call

(e.g., tabs_context_mcp or navigate)

1. Extension shows "Claude in Chrome is not connected" error
2. Clicking reconnect in the dialog does not resolve the issue

Note: This worked correctly before the March 20 update.
All permissions are correctly configured:

• Extension enabled
• Logged in with same Anthropic account
• Site access set to "On all sites"

Claude Model

Sonnet (default)

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

Claude 1.1.7714 (3bd6f6) 2026-03-19T14:50:53.000Z

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_