Rated 4 out of 5 stars

when it's not displayed on addon-bar,hide the addon-bar then mouse over the icon it would not show up the information.

This review is for a previous version of the add-on (1.3.20110715.1-signed). 

It's a long time outstanding problem. See:

UPDATE 2011-11-18: Now fixed and available in a new release - 1.3.20111118