Netscape 7.2 and the U.S. Patent Office web site?

Pardon the cross-postings here, but I'm an unsophisticated Netscape user 
trying to get info on how the Netscape/Mozilla 7.2 browser for Mac OS X 
interacts with the US Patent and Trademark Office site -- particularly 
as regards patent images and the ".jfx" image format?

The specific query is appended below.

Thanks . . . 

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When I go to the USPTO (US Patent Office) "Search by number" page, which 
is

   <http://patft.uspto.gov/netahtml/PTO/srchnum.htm>
;

using my Mac iBook G4, OS 10.3.9, Netscape 7.2, QuickTime 7.1;  type in 
a patent number (try "3553421" if you like);  bring up that patent and 
click on "Images";  and then try to view one of the image pages,  I get 
a sub-window which flashes a QuickTime icon -- but no patent image ever 
appears in it.

But if I then do a Netscape "Save As Complete Web Page" menu command, I 
immediately get a downloaded index file and a downloaded folder full of 
images on my HD.  Most of these images are gifs, but one of them, always 
labelled as "a.jfx", is the actual image of the patent page in some kind 
of an unfamiliar TIFF-like format.  

One or two of my graphics tools will open this .jfx image; most of them 
won't; and none of them have any reference to a ".jfx" image format -- 
and I haven't found any reference to "jfx" in the Netscape Guidebook 
(which I purchased), or any other Netscape documentation either.

There's also nothing in the PTO Help file about a ".jfx" format; and if 
I do a Netscape "View Source File" menu command on the PTO image page 
from which the download originated, there is no "jfx" string anywhere in 
the HTML.  So:

1)  Where the hell does that ".jfx" suffix come from? (and why?) (and 
what is "jfx"?)

2)  What might be keeping the patent image itself from showing up in the 
Netscape/QuickTime window on my system? (which is pretty much vanilla OS 
10.3.9 and Netscape 7.2)

Thanks.
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