Files
KoalaSync/extension
Koala 762d6425be fix: audit corrections for sameEpisode, CMD_ACK, lastSeqBySender, forceSyncTimeout
- sameEpisode: return false when one title is null (prevent false lobby completions)
- Episode guard: skip CMD_ACK for FORCE_SYNC_EXECUTE on mismatch (H1)
- Persist lastSeqBySender in chrome.storage.session (M3, survives SW restart)
- Clear forceSyncTimeout before overwriting (H3, pre-existing timer leak)
2026-05-28 04:45:52 +02:00
..

KoalaSync Browser Extension

A Manifest V3 Browser Extension (Chrome & Firefox) for synchronized video playback across any website.

Key Features

  • Manifest V3: Optimized Service Worker architecture with session persistence.
  • Pure Vanilla JS: No external dependencies or heavy libraries.
  • Smart Peer IDs: Hexadecimal IDs combined with customizable Usernames for easy identification.
  • Dual Heartbeat: Advanced session tracking (Background) and video synchronization (Content) to prevent ghost sessions.
  • Live Diagnostics: Built-in "Dev" tab for real-time video state debugging (ReadyState, CurrentTime, etc.).

Tab Overview

  1. Room: Manage connections, view active peers, and share invitation links.
  2. Sync: Control video playback (Play/Pause/Force Sync) and view recent activity.
  3. Settings: Customize your Username and toggle domain-based Noise Filtering.
  4. Dev: Monitor connection status and view real-time video element metadata for debugging.

Privacy & Permissions

KoalaSync requires <all_urls> permission to detect and interact with video elements (<video>) on websites.

  • No Browsing History: We do not track or store your browsing history.
  • State Management: Sensitive data (Room Passwords) is stored locally using chrome.storage.
  • Zero Telemetry: No analytics or external tracking scripts.
  • Zero Runtime Dependencies: The extension is built with pure Vanilla JS and contains no external libraries or tracking scripts, ensuring performance and privacy.

Installation

  1. Prepare Extension: From the repository root, run:
    node scripts/build-extension.js
    
  2. Open Chrome and go to chrome://extensions/.
  3. Enable Developer mode (top right).
  4. Click Load unpacked and select the dist/chrome folder.

Development

If you modify shared/constants.js, you must synchronize the changes by running the build script from the root:

node scripts/build-extension.js

This ensures that the extension/shared folder is updated with the latest protocol constants.