YouTube Addons — Power Enhancements for YouTube

Direct Extension Package & Installation

⚡ Download YouTube Addons (.zip) — Ready-to-load Chromium extension package (~404 KB).
💻 GitHub Repository — Source code built with WXT and React 18.

How to install in Chrome / Brave / Edge:

Download and extract the .zip package to a local folder.
Navigate to chrome://extensions/ in your browser.
Toggle Developer mode (top-right).
Click Load unpacked and select the extracted folder.

Overview

YouTube Addons (v1.4.1) is a specialized browser extension that supercharges the YouTube viewing experience with high-speed thumbnail quick-saves, on-device semantic vector search powered by @xenova/transformers, custom independent playlists, automated local disk backups via the File System Access API, and optional Supabase cloud synchronization.

Key Architecture & Capabilities

⚡ Quick Save Thumbnail Overlay: Injected content script overlaying instant save buttons on YouTube video cards without interfering with native playback controls.
🧠 Client-Side Semantic Vector Search: Embeds and indexes saved video titles and descriptions on-device using @xenova/transformers, delivering conceptual search without API latency or privacy loss.
📑 Autonomous Custom Playlists: Organize videos into custom topical collections detached from YouTube’s volatile watch-later queues.
💾 Local Auto-Backup Pipeline: Hooks into the browser’s native File System Access API to continuously backup video collections to a local JSON folder on your hard drive.
☁️ Supabase Cloud Sync: Optional two-way synchronization enabling bookmarks and notes to follow you across devices.
⚛️ WXT + Preact Signals Core: Built with the next-gen WXT extension framework and fine-grained Preact Signals for zero-overhead reactive state.

Tech Stack

Extension Framework: WXT (Chrome & Firefox MV3)
Frontend Stack: React 18, Preact Signals, Tailwind CSS, Radix UI Primitives
AI & Storage: @xenova/transformers, File System Access API, Supabase (Postgres)