We only want to open a default homepage or blank page if neither sessions are in use nor any uri is passed on the command line.
The bookmarks panel can display a tree of bookmarks and allows editing and deleting of bookmarks via a context menu. The XBEL implementation has been altered to work with a reference count model to allow panels to update on their own.
Don't open a blank page or the homepage respecitvely on startup if an uri is specified in the command line.