Acid Tabs makes organizing tabs ridiculously easy by automatically grouping tabs together based on customizable rules.

I love Chrome's new Tab Groups feature, but using it manually can be very tedious. I built Acid Tabs so I could be lazy again.

The extension is open-sourced here.
Strumpad
Strumpad brings the theory, allowing guitarists to easily find chords and build chord progressions without having to know theory.

I built Strumpad in an attempt to close the feedback loop between exploring and playing.
Deja is a chrome extension that lets you create "replays" from live streams (specifically HLS streams).

I mainly used this to learn HLS streaming and Go. One cool part about this approach was that you could grab a replay from your phone while watching the stream on the computer.
Arkade was a one-day POC for doing websocket-driven games using a main shared display.

You and another player could scan the main screen QR to join, then faceoff in a round of Rock, Paper, Scissors.
Frak is a small POC extension I built while testing out the MediaStream Recording API.

You click a video element you want to record, then after you pause the video it prompts you to download the created video.