[BUG] Claude in Chrome — tab with chrome://newtab origin causes invalid tab ID and connection failure

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?

Titolo: [BUG] Claude in Chrome — tab with chrome://newtab origin causes invalid tab ID and connection failure

Preflight Checklist

Ho cercato issue esistenti e questo bug non è ancora stato segnalato
È un singolo bug report
Sto usando l'ultima versione dell'estensione Claude in Chrome

What's Wrong?
When a Chrome tab originates from chrome://newtab (the default new tab page), Claude Desktop loses track of the tab after navigation occurs. The tab ID becomes stale/invalid, causing the extension to fail silently and Claude Desktop to display an account mismatch warning.

Root cause hypothesis:
Chrome does not allow extensions to access chrome:// URLs (by design, per Manifest V3 restrictions). If the extension registers the tab ID while it is still on chrome://newtab and tries to communicate before the navigation completes, the runtime message fails. When the tab navigates away, the tab ID may be re-issued or the content script context is destroyed, leaving a stale reference.

Environment

OS: macOS Sequoia 15.7.4 (24G517)
Chrome version: Version 145.0.7632.160 (Official build) (x86_64)

<img width="648" height="732" alt="Image" src="https://github.com/user-attachments/assets/6ab3e021-08e8-4ca1-9124-a048ff52ccef" />
<img width="1330" height="940" alt="Image" src="https://github.com/user-attachments/assets/dcc89dc2-c1cc-4445-97c4-d832bc89b8ba" />
<img width="1438" height="620" alt="Image" src="https://github.com/user-attachments/assets/8c274a7e-631b-4f7f-a8d7-e60dd384d5fa" />

Extension version: Claude in Chrome (Beta) 1.0.57
Plan: Pro

What Should Happen?

Expected behavior: Claude in Chrome correctly tracks the tab after navigation and maintains a valid tab ID.
Actual behavior: The tab ID becomes invalid after navigation from chrome://newtab. The extension cannot establish a connection (Receiving end does not exist), and Claude Desktop shows a spurious "Controlla il tuo account Claude in Chrome" warning (account mismatch dialog), which is misleading — the accounts are correctly matched.

Error Messages/Logs

Errors observed in DevTools console (service worker context):
Unchecked runtime.lastError: Cannot access a chrome:// URL
Uncaught (in promise) Error: Could not establish connection. Receiving end does not exist  [mcpPermissions-BZasRJR4.js:3]
Unchecked runtime.lastError: Cannot access a chrome-extension:// URL of different extension
Unchecked runtime.lastError: No tab with given id 1636312188

Steps to Reproduce

Steps to Reproduce

Open Claude Desktop with Claude in Chrome extension active and connected
Open a new Chrome tab (default page: chrome://newtab)
Navigate to any website from that tab
Attempt to use Claude in Chrome on that tab

Claude Model

Sonnet (default)

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

not using code only chat and cowork

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_