Playwright Automation

Connect Playwright to Multilogin X browser profiles using Chrome DevTools Protocol (CDP).

Starting a Profile with Playwright

Start a browser profile with automation_type=playwright:

curl "https://launcher.mlx.yt:45001/api/v1/profile/f/FOLDER_ID/p/PROFILE_ID/start?automation_type=playwright" \
  -H "Authorization: Bearer YOUR_TOKEN" \
  -H "Accept: application/json"

The response contains connection details for Playwright's CDP connection.

Connecting with Python Playwright

import asyncio
from playwright.async_api import async_playwright

async def main():
    # Get the CDP URL from profile start response
    cdp_url = "ws://127.0.0.1:PORT/devtools/browser/BROWSER_ID"

    async with async_playwright() as p:
        # Connect to running Multilogin profile
        browser = await p.chromium.connect_over_cdp(cdp_url)

        # Get the default context
        context = browser.contexts[0]
        page = context.pages[0] if context.pages else await context.new_page()

        # Automate
        await page.goto("https://example.com")
        print(await page.title())

        # Disconnect (profile stays open)
        await browser.close()

asyncio.run(main())

Node.js Playwright

const { chromium } = require('playwright');

(async () => {
    const cdpUrl = 'ws://127.0.0.1:PORT/devtools/browser/BROWSER_ID';

    const browser = await chromium.connectOverCDP(cdpUrl);
    const context = browser.contexts()[0];
    const page = context.pages()[0] || await context.newPage();

    await page.goto('https://example.com');
    console.log(await page.title());

    await browser.close();
})();

Playwright Workflow

Playwright vs Selenium

Feature	Selenium	Playwright
Protocol	WebDriver	CDP (Chrome DevTools)
Languages	Python, Java, JS, etc.	Python, JS, .NET, Java
Speed	Standard	Faster (CDP direct)
Auto-wait	Manual	Built-in
Multiple browsers	Yes	Yes
Best for	Legacy, broad compat	Modern automation

Best Practices

• Use connect_over_cdp (not launch) to attach to Multilogin profiles
• Access existing contexts and pages rather than creating new ones
• Use Playwright's auto-wait features instead of manual sleeps
• Disconnect cleanly when done to avoid orphaned connections