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How to check your site in Firefox, WebKit or Edge through the agent with Playwright MCP

Choose the browser with the --browser option so the agent tests beyond Chrome.

Short answer: Add the server to your client; then set the --browser option to chrome, firefox, webkit or msedge (or the PLAYWRIGHT_MCP_BROWSER variable); ask the agent to load the page and compare layout and errors with Chrome. All steps.

Who it is forA developer who wants a quick cross-browser check without a device lab.

The problemBugs that only appear in Safari's engine or Firefox slip through Chrome-only testing.

The outcomeThe same agent-driven check run in another browser engine.

What you need first

  • Node.js
  • An MCP client such as Claude Code, Codex, Cursor or VS Code

Steps

  1. Add the server to your client
  2. Set the --browser option to chrome, firefox, webkit or msedge (or the PLAYWRIGHT_MCP_BROWSER variable)
  3. Ask the agent to load the page and compare layout and errors with Chrome

Prompt for your agent

Configure microsoft/playwright-mcp with --browser webkit, load <url>, and list any console errors or broken layout compared with Chrome.

Caveat.

Use this in your AI agent

Ask your agent

Using the Deduped MCP, get the setup steps for microsoft/playwright-mcp and "Check your site in Firefox, WebKit or Edge through the agent"

Add Deduped to Claude Code once

claude mcp add --transport http deduped https://dedupedai.com/mcp

Cursor, ChatGPT, others

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Third-party repos we don't own. AI-written use cases can be wrong. Disclaimer