A timer in the toolbar on any tab: today and last week, the task browser, Add time, and a nudge when the computer was idle while it ran. The same timer as the one in this header. Alt+Shift+1 starts and stops it.
2. In Chrome open chrome://extensions, switch on Developer mode, click Load unpacked and pick the unzipped folder.
3. Click the Spark icon and paste your key:spark-demo-mn
Prototype: time from the extension is kept on the demo server and resets when it restarts. Everyone using the same key shares one timer. Viewing as someone else (bottom left) shows their key.