Hippo:namespaces in Documents>Configuration shows namespaces like hst

Logged in as admin, in Browse documents -> Configuration, click hippo:namespaces. The following namespaces are in the document listing:
ef, hgge, hippogallerypicker, hippogogreen, hippogogreengallery, hippotaxonomy, hst, poll, selection, tcmp.
See screenshot.

In CMS7-5095 a filter was created to hide these from the folder view. They are still in the document listing.