Browser39: A Headless Web Browser for AI Agents
Browser39 is a headless web browser built specifically for AI agents. It runs locally as a single binary with no dependencies, external browser requirements, or fees.
Core Features
- Converts web pages to token-optimized Markdown locally
- Executes JavaScript
- Manages cookies and sessions
- Queries the DOM
- Fills forms
- Content preselection
- Encrypted session persistence
- Auth profiles that keep credentials out of the LLM context
- DOM queries via CSS selectors and JS expressions
Integration Options
Browser39 offers multiple integration methods:
- MCP (stdio + HTTP) for Claude Desktop, Claude Code, and any MCP client
- JSONL file-based IPC for any language (Python, Node, Rust, shell)
- CLI for one-shot fetch
- OpenClaw Plugin
Installation
For OpenClaw users:
openclaw plugins install https://github.com/alejandroqh/browser39.gitThe tool is available on GitHub at https://github.com/alejandroqh/browser39.
📖 Read the full source: r/openclaw
👀 See Also
Multi-Agent Loop Failures Are Org-Design Failures, Not Prompt Failures
Agent loops bouncing between peers aren't prompt bugs—they're org-chart problems. Treat agent networks as hierarchies with clear stop authority.
Flash-MOE Benchmark on M5 Max: 12.99 tok/s with Qwen3.5-397B
A benchmark of the 397-billion-parameter Qwen3.5 model running locally on a MacBook Pro M5 Max with 128GB RAM achieved 12.99 tokens per second using 4-bit quantization and cache-io-split 4, three times faster than the original 48GB benchmark.
Hippo v0.21.0: Biologically-Inspired Memory for AI Agents with Multi-Tool Support
Hippo v0.21.0 introduces one-command setup for multiple AI coding tools including Claude Code, OpenCode, OpenClaw, Codex, Cursor, and Pi. The memory system features decay, retrieval strengthening, and consolidation with zero runtime dependencies.
engram v3.4.0 Adds Anthropic Plugin to Keep Claude Code Running Under New Rate Limits
engram v3.4.0 introduces a dedicated Anthropic plugin for Claude Code, adding three skills to manage costs, query context, and surface errors. Install with `/plugin install engram` or `npm install -g engramx@latest`.