Bookmarks in Safari are organized, at the very top level, into collections. Same thing in Camino except they are called groups. In Bookdog, we use Safari's word, collections, but as far as we are concerned group=collection. Your collection/groups appear in the left pane when you choose from Safari/Camino's menu:
Bookmarks > Show All Bookmarks.
Your collections include:
Note: This pane also show several proxy collections:
These proxy collections are either stored elsewhere or computed on-the-fly by Safari/Camino. They are not available to Bookdog and are not sorted or included in any analysis by Bookdog.
Firefox only has a "Bookmarks Toolbar Folder" but does not give any special treatment to collections/groups as Safari/Camino does.