Persona and Silvermel/Charamel living together in Firefox 3.6
Starting from Firefox 3.6, the Persona addon is installed by default. However, instead of an extension, it is now a theme, sitting in parallel to Silvermel/Charamel. This means you can either use the Silvermel/Charamel theme, or the Persona theme. You can't use both together as when you use Firefox 3.5 or before. To fix the problem, you can first uninstall the Persona extension, and then reinstall it from Mozilla addon site (The most recent 1.5.2 version doesn't work, install some older version instead). Finishing these two simple steps, you can enjoy the benefit of both Silvermel/Charamel and Persona at the same time once again.