Personas has officially joined the Themes family on AMO! The renaming is finally complete, and we’d like to thank you for your patience. People looking for ways to change the look of their Firefox no longer have to worry about the difference between a “background” theme and a “complete” theme. Simply click over to the Themes section and start trying on skins by mousing over the designs, or click over to the Complete Themes section for deeper customizations.
Work on the migration of getpersonas.com continues, and there is a lot of progress being made, so stay tuned for that!
If you are looking for Mozilla Persona, an identity system for the web, it can be found here: http://www.mozilla.org/persona/