Since I eliminated my wall calendar this year and started using Google Calendar to write down all my important dates, I have been catching myself from time to time looking up at the blank spot where the wall calendar used to be. While browsing through extensions I think I may have found one to help me get my date fix. the Date Picker/Calendar extension gives you a little date and time notification the bottom of the Firefox window.
This extension will add the current date/time to a small pane in your status bar. You can then click the date and a calendar will pop up, where you can scroll through months or years looking for the date you’re interested in. When you click a date in the calendar, it will be displayed in a handy text box which then allows you to copy it out for whatever purpose.