I am try to use quintagroup.portletmanager.footer into Plone 4.3.3 then enable it and when access to /@@manage-footer and look like this:
Then quintagroup.portletmanager.footer doesn't show the portlets to add from select list
It might have something to do with security. I 'used my old code' when adding a portlet manager in Plone 5, and your result seems very similar:
(maybe it is :
* include package="Products.CMFCore" file="permissions.zcml"/>
which my original code did not have.
This worked: Above content portlets in Plone 5