> Implementing a better vertical layout by exploring the possibility of not using the <tree> XUL element and relying on a highly scalable and equally perfor

> Implementing a better vertical layout by exploring the possibility of not using the <tree> XUL element and relying on a highly scalable and equally performant HTML component. Hey, does that mean we can have two lines per mail in the mail column :) ? Otherwise, I am not convinced by matrix integration. Unless it's a deep one and creates new scenarios impossible with two standalone applications.