Sorry, but I skimmed over this in the original message.
| ==> (Where's my Mosaic for MVS? :-)
Well, it's neither Mosaic nor MVS, but there is a www MF client:
This is the README for "Albert" version 1.3.x (formerly named UF-WWW).
Albert is a fullscreen web browser from the University of Florida for
IBM 3270 terminals (or emulations). Albert runs on IBM's VM/CMS
mainframe operating system. Albert is essentially an Xedit macro that
uses the the CERN linemode WWW client to get the source for files and
then does its own formatting (including HTML parsing).
A public-access demonstration is available on the Internet by making a
tn3270 connection to nermvs.nerdc.ufl.edu. You'll be presented a
menu, in which you should select (or type in the word) UFINFO.
I don't know whether or not it is firewalls/socks/proxy friendly. 8-)