Fauxton is nice and shiny, but it is missing at least one critical feature for working with CouchDB: browsing a document's revision history. The database permission interface also managed to create a mess of my database.
Is there any way to get the old futon running on CouchDB 2.x?
Yes, you can use futon with CouchDB 1.x version.
CouchDB Team decided to use it as a default web-based interface & included with CouchDB 2.x. Fauxton is a native web-based interface built into CouchDB.
https://couchdb.apache.org/fauxton-visual-guide/