Multi-session browser MCP server
15 parallel sessions. Full isolation. One server.
The problem
You have multiple Claude Code terminals open. Each one needs browser access.
The moment the second terminal tries to touch the browser, both fight over the same instance. One crashes. One waits.
Every browser MCP on the market gives you one session. One browser. One agent at a time.
Leapfrog gives you fifteen.
The solution
Each session runs in its own BrowserContext — separate cookies, localStorage, cache, and fingerprint. They never leak state.
pool: 15/15 active | 0 conflicts | 52MB heap
What's in the box
Each session gets its own cookies, storage, and fingerprint. Session 1 on GitHub and Session 5 on Gmail never share a single byte.
Bezier mouse paths, log-normal keystroke timing, smooth scroll with natural variance. 6 humanization modules that make automation look like a person at a keyboard.
Import your real Chrome profile — cookies, history, saved logins. Sites trust you because you ARE you. No fake fingerprints. No disguise needed.
200-entry traffic ring buffer with regex filtering. Route-based interception — block ads, mock API responses, log specific patterns. All controllable mid-session.
Disconnect detected, sessions cleaned, fresh Chromium on the next call. No zombie processes. No orphaned contexts.
Save cookies and localStorage to disk. Mount on any future session. Your agent picks up where you left off.
Accessibility tree snapshots instead of raw DOM. Your agent sees @e3 button "Submit" — not 14,000 tokens of div soup.
When a site opens a popup or redirects to an OAuth flow, Leapfrog follows. Switch between tabs by index. Nothing gets lost.
How it stacks up
agent-browser wins on raw token count. browser-use has 81K stars. Stagehand has the best natural language DX. Leapfrog ships the combination nobody else does.
| Leapfrog | Playwright MCP | agent-browser | Stagehand | |
|---|---|---|---|---|
| Parallel sessions | 15 (isolated) | 1 | 1 | Cloud (paid) |
| Session isolation | Full | No | No | Cloud |
| Tokens / page | ~1,400 | ~14,000 | ~300 | ~2,000+ |
| Network intercept | Yes | No | No | No |
| Real browser profiles | Yes | No | No | No |
| Crash recovery | Auto | No | No | Cloud |
| Local-first | Yes | Yes | Yes | No |
| Price | Free (MIT) | Free | Free | Paid tiers |
Ready to jump in?
Works with Claude Code, Cursor, Windsurf — anything that speaks MCP.
One agent was signing up for backlinks. Another was pulling competitor data.
Same browser. Same crash.
That's not a multi-agent workflow. That's a collision.
I needed browsers that couldn't interfere with each other. Not two. Fifteen. Each with its own cookies, its own storage, its own fingerprint. No shared state. No tug of war.
One server. Zero collisions. That's the product.