Claude in Chrome browser extension not connecting to Claude Code

OS: Windows 11 Pro (10.0.26200)
Chrome Extension: Claude by Anthropic (installed, visible in toolbar)
Extension account: burning-heads@gmx.de
Claude Code account: burning-heads@gmx.de (verified via claude auth status)

## Description
Every call to tabs_context_mcp returns:
"Browser extension is not connected. Please ensure the Claude browser extension is installed and running."

## Steps to reproduce

1. Install Claude Chrome extension
2. Log into claude.ai with same account as Claude Code
3. Run Claude Code browser automation
4. Error returned immediately

## What was tried

• Verified extension is installed and active
• Both extension and Claude Code use same account (burning-heads@gmx.de)
• Restarted Chrome completely
• Retried multiple times — issue persists