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LastBrowser Developer Handbook

Welcome to the official LastBrowser documentation portal. LastBrowser combines the browser engine with a native Windows terminal, multi-account Spaces and the Sidekick copilot engine.

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Quick Start

Install on Windows 10 & 11, take your first steps with the vertical sidebar and choose the AI mindset.

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ConPTY Terminal

Use Windows PowerShell and CMD right inside the browser sidebar, including Terminal Doctor diagnostics.

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Spaces & Partitions

Learn how persist:profile:space fully isolates cookies and caches from each other.

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Model Context Protocol

Configure your own databases, filesystems and APIs as tools for Sidekick.

Local Filesystem & Configuration

LastBrowser stores all application data locally on your PC. No unsolicited data is transmitted to cloud services.

Storage paths on Windows

%APPDATA%\Lastbrowser\
├── config.json         # Browser settings & themes
├── mcp_servers.json    # Model Context Protocol configurations
├── spaces\             # Isolated partition data per Space
│   ├── default\        # Cookies, cache, IndexedDB
│   └── work\           # Separate cookie jar
└── secrets\            # API keys encrypted with Windows DPAPI

Support & Feedback

For questions or feedback, visit our support portal or open a discussion on GitHub. For enterprise customers and SLA inquiries, contact [email protected].