OpenTabs: MCP Server with 100+ Plugins for Browser-Based AI Tool Access
OpenTabs is an MCP server paired with a Chrome extension that provides access to web applications through their internal APIs rather than public APIs. The system includes 100+ plugins exposing approximately 2,000 tools.
How It Works
The Chrome extension injects plugin adapters into matching browser tabs. The MCP server discovers these plugins at runtime and exposes their tools over Streamable HTTP. This approach allows AI agents to call functions like slack_send_message that hit the same endpoints the web app's frontend uses, running within the browser with the user's existing session.
Key Features
- No API keys or OAuth flows required
- No screenshots or DOM scraping
- Works with Claude Code, Cursor, Windsurf, or any MCP client
- Includes a plugin SDK for building new plugins
Setup and Usage
Install via npm: npm install -g @opentabs-dev/cli
Start the server: opentabs start
Plugin Development
The SDK includes a skill that improves with each plugin built—patterns, gotchas, and API discoveries get written back into it. According to the developer, you can point your AI at any website and it builds a plugin in minutes.
Current Status
The developer uses 5-6 plugins daily (Slack, GitHub, Discord, Todoist, Robinhood) and considers those solid. There are 100+ total plugins, but most need more testing. The developer requests help: if you try a plugin and something's broken, point your AI at it and open a PR.
📖 Read the full source: r/ClaudeAI
👀 See Also
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Local Memory System for AI Coding Tools Extracts 2,600+ Facts from Conversation Logs
A developer built a local memory layer that ingests conversation logs from Claude Code, Factory.ai, and Codex CLI, extracts structured facts using a local LLM, and auto-injects context into new sessions. After months of use, it has indexed 13,000+ messages and extracted 2,600+ facts.
mycrab.space introduces SKILL.md and Prompt Autocomposer for standardized app deployment
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