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KoalaDev
dfa0a3d03e
Findings recovered from the multi-agent audit (verification phase was cut off by a
usage limit; verified inline against the code):
HIGH:
- Host was demoted on peerId dedup (fast reconnect / second tab): the dedup path
removes the old socket and the kicked socket's 'disconnect' both ran the
host-leave fallback before the same peerId re-joined → room silently unlocked on
every host network blip. Now skip the fallback while a join for that peerId is in
flight (peerJoinLocks). Regression test added. (A long real disconnect still
falls back — that's the deferred host-grace EC-10.)
- Episode auto-advance froze a gated guest: in host-only the guest's EPISODE_LOBBY
is dropped server-side, but the guest still self-paused (PAUSE_FOR_LOBBY) waiting
for readies that never came → 60s freeze. A host-only guest now skips creating a
lobby (the host drives episode sync).
LOW / cleanup:
- GET_HCM_STRINGS could return a raw key name ("HCM_DIALOG_TITLE") if the locale
dictionary failed to load (getMessage returns the key on miss) → omit it so
content keeps its English fallback.
- hcmReset now also clears the snap-back cooldown + buffering grace, so a stale
cooldown can't swallow the first snap-back after a room/host change.
- Popup play/pause labels reset on lock too (not just unlock), so a button can't
freeze on "Playing…" when host-only activates mid-click.
- Fix a stale comment (heartbeat now carries 'desynced').
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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.
- On-Demand Connection: The service worker only maintains a WebSocket connection while you're in a room. No persistent background connections — privacy-first architecture. Based on
connectIntentflag that gates all reconnect attempts. - Live Diagnostics: Built-in "Dev" tab for real-time video state debugging (ReadyState, CurrentTime, etc.).
- Dynamic i18n (Multi-Language): Fully localized in 13 languages (
en,de,fr,es,it,pl,tr,nl,ja,ko,pt-BR,pt,ru) with auto-detected fallback and dynamic on-the-fly language selectors.
Tab Overview
- Room: Manage connections, view active peers, and share invitation links.
- Sync: Control video playback (Play/Pause/Force Sync) and view recent activity.
- Settings: Customize your Username, toggle domain-based Noise Filtering, and switch the App Language.
- 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
- Prepare Extension: From the repository root, run:
npm run build:extension - Open Chrome and go to
chrome://extensions/. - Enable Developer mode (top right).
- Click Load unpacked and select the
dist/chromefolder.
Development
If you modify shared/constants.js, you must synchronize the changes by running the build script from the root:
npm run build:extension
This ensures that the extension/shared folder is updated with the latest protocol constants.
Module Structure
| File | Purpose |
|---|---|
background.js |
Service worker: message routing, tab listeners, startup |
content.js |
Video detection, audio processing, episode transition (IIFE) |
popup.js |
Popup UI: join/create, tabs, status, settings |
bridge.js |
Landing page bridge (injected into sync.koalastuff.net) |
episode-utils.js |
Shared extractEpisodeId() / sameEpisode() — used by background.js, injected into content.js at build time |
i18n.js |
Translation loader |
shared/ |
Constants, blacklist, name generator |