I did do a reboot, but the problem remained. The only change to the system was the Firefox upgrade, and the problem is confined to Firefox. So, I am convinced they changed something, and probably will hear from other users about it. Until they und...
I forgot to answer your question -- all I got was a "download failed" message. My previous setting had been to "open with Foxit" and then I tried "download". Both had the same result.
Thanks for the tips. I had tried most of them, and it didn't help. However, I did change the settings to "open in Firefox" and was able to open them, then save to the computer. So now it just takes 2 steps to do what used to take only 1. Thanks f...