Semantic Memory — Privacy-First Semantic Browser History

A Chrome extension that indexes everything you browse using local ML embeddings and lets you query your history semantically — entirely on-device, zero data leaves the browser. Search by meaning, not keywords 100% on-device by default Optional encrypted sync

How It Works

You browse the web
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Content script extracts clean text (Readability.js)
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Text is chunked (512 tokens, 64 overlap)
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Chunks are embedded in-browser (MiniLM-L6-v2, ONNX int8, ~23ms/chunk)
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Embeddings stored in an in-memory vector index + IndexedDB (persisted)
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You search from the popup: "that article about transformers"
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Query is embedded → ANN search → ranked results with similarity scores

Everything above runs entirely in your browser. No servers, no API calls, no data leaves your machine. The optional backend adds: - Cross-device sync (end-to-end encrypted — server sees only opaque blobs) - Cross-encoder re-ranking for precision boost - Topic clustering + knowledge graph (UMAP + k-means) Features The popup is organised into four tabs, all powered by on-device ML: | Feature | What it does | |---|---| | Semantic Search | Natural-language search over your history with per-result similarity scores. Matching query terms are highlighted in titles and previews, and results are deduplicated by page (best-scoring chunk wins). | | Quick Summary | One-click extractive summary + key points of the page you're currently on (centroid-based sentence ranking). | | Find Similar | Surfaces related pages from your history based on the current page's content. | | Timeline | Your browsing history grouped by day, filterable by today / week / month / all. | | Analytics | Total pages, chunks, domains, reading time, and a top-domains breakdown. | | Settings | Domain blacklist (skip indexing), opt-in encrypted sync config, and data export / clear. | | Context menu | Right-click selected text → "Search Semantic Memory" (opens the popup pre-filled). | | Shortcut | Ctrl+Shift+S (Cmd+Shift+S on macOS) opens the popup. | Recent searches, animated stats, and a live "index active" indicator round out the UI.

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