That seems to have fixed it.  Thenks very much!

I logged out of my Firefox account and restarted my browser.  No change.

I logged out of my Eversync account and logged in with a different account. Went through whole process of removing and adding Speed Dial App again.  Still not working.

I don't use any cleaners that I am aware of.  My computer is on an administered system, so I can't use Anydesk.  My Speed Dial worked fine before I refreshed Firefox to get embedded links to work again.  All my other add ons seem to be working since they reinstalled  I also got our IT guy to completely uninstall and reinstall Firefox to see if that might help, but it didn't.

Speed Dial still works fine on Chrome on the same computer.  I've been a Firefox user for many years, but the changes they have been making lately in the name of "security" have rendered it unusable to me, so I am pretty much just switching to Chrome or other Chromium-based browsers.  I guess Firefox will be really secure when no one is using it.

One other question - although my Speed Dial is turned on, the icon in my app list still appears gray instead of color (see below).  I've tried turning it off and on and even uninstalling and reinstalling, but no change.  Is that normal?  It's in color on the browser bar.