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Developer builds local-first tab manager with MCP server for AI-powered tab organization

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A designer-developer frustrated with tab manager limitations built Mos Tab, a personal browser extension that stores data locally with no account or tab-saving caps required. The tool uses a hierarchical data model and a Zustand store persisted to Chrome's local storage, overriding the new tab page with a dashboard that includes productivity features. For optional cross-device sync, the developer implemented a Cloudflare Worker backend using a single JSON blob per user and a client-side three-way merge strategy to handle conflicts. A persistent bug involving multiple browser windows triggering infinite sync loops was resolved by restricting write permissions to the focused window only. The project was later extended with a remote MCP server, allowing AI assistants like Claude to search and reorganize the user's saved tabs.

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Developer builds local-first tab manager with MCP server for AI-powered tab organization · ShortSingh