Messenger Plus! 5
Basically, the add-on lets you change the look of the messaging program, sort your conversations into tabs, save them in a more organized way and even encrypt them for security. It will also let you open more than one session at a time, embellish your name or nick and much more.
Outstanding among the novelties of Messenger Plus Live 5 is the inclusion of MyPlus!, a social network for users of the popular messaging program.
To top it off, you will also be able to choose among other extra modifiers (scripts) that are available to customize your messaging program even more.