Comment 113 for bug 193141

Created an attachment (id=296319)
wip

mano: this is working for everything but not for dynamic containers in the left pane, mainly because
this.getFolderContents(aNode.itemId, false, false).root;
returns an empty container for left pane bookmark menu, toolbar and unfiled, because they are place:folder=x... so having no children the option open all in tabs is disabled.
how can i get correct content? changing expandQueries option does not work (the interface says that for simple folder queries it has no effect since they should be expanded by default)