Simple and effective, as it should be.

Shows a clickable icon with the day's todo count that opens the webapp in a little frame. That's really all it does and all it needs to do.

The only improvements I can think of would be a keyboard shortcut to open and focus the window, and maybe some tweaks around the caching to reduce the render lag on startup. Admittedly performance in the ever-changing world of browser extensions is a non-trivial problem and they're already at an acceptable level, so not a huge deal.

Overall a solid addition to the Todoist product.