Helium Browser

Helium (https://helium.computer/) is a Chromium-based browser. Attach over CDP to control the user's live Helium with its real tabs, cookies, and logins.

Every new CDP connection makes Helium show an "Allow remote debugging?" prompt that the user must click. Use exactly one connection per task, held open by the tool's daemon or server. Tell the user right before connecting so they can approve it. Never retry a failed connection in a loop or open extra "test" connections; each one is another prompt.

Pick a tool

Use the first one available, then read only its reference:

1. agent-browser (command -v agent-browser): references/agent-browser.md
2. chrome-devtools-mcp (an MCP server configured for Helium): references/chrome-devtools-mcp.md
3. playwright-cli (command -v playwright-cli), only after checking its known issue: references/playwright-cli.md

Prerequisite

The user enables remote debugging once at helium://inspect/#remote-debugging. It persists across restarts. While enabled, Helium writes DevToolsActivePort into its user-data directory: