Rated 5 out of 5 stars

excellent plugin, but yahoo mail is still a trainwreck which causes many problems not related to the brilliant execution of this plugin; peep this article for essentially everything wrong with yahoo mail:

http://variableghz.com/2009/01/why-yahoo-mail-still-sucks/

This review is for a previous version of the add-on (1.0.0.16).