Notes:
The extra scripts you create know about the various
redirected ports. Bind them to menus and hotkeys
in your window manager to maximize convenience.
Another script would be one to start a second netscape
with a modified $HOME that knows the port proxy.
If connection gets severed and some redirs were in
progress, some ports could be in TIME_WAIT state,
if you then immediately try to reestablish the connection
the new ssh processes can't open the ports and will
fail. You may have to wait, or ssh in and kill processes
by hand...