Browser tab access lost

“On a subsequent turn in the same conversation, access fails with browser.user is unavailable. Resetting and reconnecting restores access.”

Is this your bug? What gets counted gets fixed. Pile on.

Paste this into your agent. It files your report, with your error and version.

I hit this bug: rapsheet.dev/sheets/codex/issues/23147/file
Follow it to file my report. Show me the text before you send.

No install. No account. Public and anonymous. The link asks your agent for one report, nothing else. What it sends

Growing. 3 reports and thumbs-up in the last 7 days and 2 the week before. A workaround is known.

Built-in browser tab access fails on later turns. Reading or rebinding an existing tab fails on the next message in the same chat, while the tab is still listed.

Is this your bug?

File my report

Where: In-app browser
Error text: browser.user is unavailable.
Versions: 26.1027.30824 to 26.1027.51404
Platforms: macOS, Windows
How bad: Breaks a normal workflow.

Part of: Browser control fails to connect36 bugs

Request-header policy load failure16 people
Chrome extension not detected16 people
Browser control times out12 people
Chrome tab operations fail8 people
Browser disabled despite toggle11 people
Browser access host unavailable12 people
Browser tab control fails4 people
Agent finds no browser5 people
Browser access host unavailable9 people
Chrome tab control timeoutMs error7 people

Show all 35Show only the largest 10

Browser unavailable to assistant4 people
Embedded browser unusable when sidebar keeps client-new-thread conversation ID5 people
In-app browser not available4 people
Browser service module missing3 people
In-app browser policy check fails2 people
Browser tools missing in chat4 people
Chrome connection drops2 people
Browser ID unavailable2 people
Built-in Browser unreachable2 people
Chrome native host not registered2 people
Chrome tab listing fails2 people
Chrome not available to runtime2 people
Chrome debugger detaches, CDP timeouts3 people
Browser Use policy check fails3 people
Side-panel browser control fails2 people
Chrome page loads stall while browser control resolves paused document responses4 people
Browser access host unavailable15 people
Chrome missing from @ menu3 people
Browser context error in Chrome4 people
Browser access host unavailable3 people
Lost cua_repl browser tool2 people
Chrome browser access unavailable3 people
Browser extension connection lost5 people
Browser.list_tabs context error4 people
Browser reported disabled in chat4 people

Original reports4, newest first

Nov 4, 2026Browser Use: browser.user is unavailable when reusing IAB tabs across turnsOn GitHub#59382
Nov 2, 2026built-in browser access fails between chat messagesOn GitHub#59005
Oct 30, 2026[macOS][IAB] Browser access fails across turns with “browser.user is unavailable”; reset restores accessOn GitHub#58386
Oct 29, 2026[macOS][IAB] Preserved tab fails across turns with browser.user is unavailable on 26.1027.30824On GitHub#58236