I wasn't the first to have problems with the link to the flash plugin at this article:
https://portableapps.com/support/firefox_portable#plugins
I am still not sure what was happening, but I was definitely getting a download error. It's not there now.
I was able to confirm that I could right-click and download the xpi file to my Desktop and then install it. I suppose I should uninstall everything and see if that is any more predictable on a clean system.
Oh well, thanks for checking.
Link still works for me.
The developer formerly known as ZGitRDun8705
for me.
So it must be you
"What about Love?" - "Overrated. Biochemically no different than eating large quantities of chocolate." - Al Pacino in The Devils Advocate
Ya, it's back now. Sorry for the false alarm.
MC