This is the best snooze button I've used in Firefox. Excellent use of left/right click options.

A few things that I think would improve it:

1) The ability to add our own snooze times to the right-click menu (i.e. 3 hours, 15 days, whatever)

2) When you click on a date in the following month, for the calendar to switch to that month (I've used to this behaviour in most other apps that have this sport of option)

3) not having it default to the top of the hour (so if I double click on 4, and it's currently 2:21, having it unsnooze at 4:21 rather than 4:00)