SyncMix - YouTube MUSIC Crossfade Chrome extension security report

SyncMix – Automated Crossfader & Queue Mix for YouTube Music Say goodbye to silent gaps between songs. SyncMix is a browser extension that brings smooth, automated crossfading and intuitive queue management to YouTube Music, so your listening experience flows seamlessly from track to track. Build your mix queue, your way Add tracks to the queue one by one — every song on YouTube Music gets a MIX tag that queues it in a single click. Browsing a playlist or an album? The "Add All to SyncMix" button loads the entire list into the queue instantly. Once in the queue, tracks can be freely reordered or removed at any time. Set how every track in the queue starts Define a Global IN Time that applies to all tracks in the queue at once — every newly added song inherits this start point automatically. Need to fine-tune a specific song? Each track has its own independent IN and OUT cue points, adjustable via a draggable marker on the visual timeline or by typing an exact value in seconds. Smooth, automatic crossfading When a track reaches its OUT point (or its natural end), SyncMix automatically triggers a smooth crossfade to the next song in the queue. You can also hit the CROSSFADE button at any moment to trigger the transition manually. The crossfade duration is configurable in the queue header, and you can choose from four transition curves: Equal Power (Sin/Cos), Club Blend, Linear, or Natural (S-Curve) — each giving a different feel to the blend. Two-deck live view The side panel shows both active decks at once: NOW PLAYING with live playback position, and the STANDBY (UP NEXT) deck already preloaded with the next track. Both decks display their cue IN/OUT positions on a miniature waveform timeline so you always know where each transition will happen. Headphone monitoring (CUE – 3rd tab) Open a third YouTube Music tab and assign it as the CUE output in the Audio Routing settings. You can route Deck A/B (main mix) to your speakers and the third tab to your headphones — letting you silently preview upcoming tracks while the current mix plays uninterrupted. Optional BPM analysis & beat alignment For advanced users: enable the optional local Python backend to unlock BPM analysis and beat phase alignment. When active, SyncMix reads the BPM of both tracks and aligns their beat grids at the moment of transition so the crossfade lands on the beat — without changing the playback speed. Fully local, no account required Everything runs directly in your browser. No audio is sent to external servers, no data is collected, no sign-in needed.