Mozillazine has a new Firebird preview article: (Rapid Pace of Development for Mozilla Firebird. Among other things it addresses one of the issues Anil brought up about accessing sidebars.
First of all, any bookmarked page can be made to load in the
sidebar via a simple checkbox in its properties dialogue. In addition,
support is also offered for the Mozilla Application Suite’saddPanelAPI,
which causes a bookmark that is already set in to open in the sidebar
to be created. Furthermore, Opera’s method for adding panels to its
sidebar equivalent, the Hotlist, is also supported (this method simply
involves a normal link with arel="sidebar"attribute). By creating a link with atarget="_search"
attribute (named for compatibility with Internet Explorer), a site can
cause a page to be loaded transiently in the sidebar, with no bookmark
being created.
Very good.