readonly PRUint32 childCount

This gives you the children of the nodes. It is preferrable to use this interface over the array one, since it avoids creating an nsIArray object and the interface is already the correct type.

readonly PRBool childrenReadOnly

Returns false if this node's list of children can be modified (adding or removing children, or reordering children), or true if the UI should not allow the list of children to be modified. This is false for bookmark folder nodes unless setFolderReadOnly() has been called to override it, and true for non-folder nodes.

PRBool containerOpen

Set this to allow descent into the container. When closed, attempting to call getChildren or childCount will result in an error. You should set this to false when you are done reading.

For HOST and DAY groupings, doing this is free since the children have been precomputed. For queries and bookmark folders, being open means they will keep themselves up-to-date by listening for updates and re-querying as needed.

readonly AUTF8String dynamicContainerType

This is a string representing the dynamic container API service that is responsible for this container. This throws if if the node is not a dynamic container.

readonly PRBool hasChildren

This indicates whether this node "may" have children, and can be used when the container is open or closed. When the container is closed, it will give you an exact answer if the node can easily be populated (for example, a bookmark folder). If not (for example, a complex history query), it will return true. When the container is open, it will always be accurate. It is intended to be used to see if we should draw the "+" next to a tree item.