FPP, Firefox and Proxy Links not working

[richardln2]

Not sure when proxy links stopped working... It worked just before Thanksgiving when I updated all my Pi FPP players to 9.3.  
When I click on the Proxy links I setup on the Proxies page, now instead of opening the controller page, it opens the file save-as dialog with a random(?) filename without extension.

If I save the file, then open the file using the browser it does display the remote controller (but setting changes do not seem to update).

I suspect that a recent Firefox update has changed how these proxy links are handled.  Searching online seems to indicate that Firefox may be confused about link file type.

Versions:
Windows 10
FPP:  9.3-5-g2e2d5d7d 
Firefox: 146.0 (32 bit)

I have tried Chrome, but it says link is insecure and will not allow connection. I tried modifying site settings but no joy.  
I have not tried Windows Edge as I don't want it on my computer...

Anyone else seen this???
 

[richardln2]

Forgot to mention my setup:

Primary FPP player (RaspberryPi) on Wifi on my home network (192.168.1.x)
  Display controllers all connected to wired network attached to that Pi (192.168.100.x):
  2x remote Pi players
  1 Alphapix Evolution
  1  Alphapix16
  1  Alphapix4
  misc DMX controllers attached to  Alphapix Evolution DMX port.

It's the controllers on the remote network (100.x) that I'm trying to access.