If you have a longish DB/namespace name, the labels on the tabs become pretty useless, as all they say is "Documents (verylongdbnamewhichiknowalready)" and there's no room for the name of the collection.

This forces me to navigate through tabs to find the collection I was querying.
I feel that the "Documents" or whatever main label is on the tabs can be communicated via the tab icon only.

The name of the namespace could either be hidden entirely and shown only on the tab body, or shown on a separate line from the collection name.