So far it seems I can run most of my AddOns if I use version 40.03. I think Theme Font and Size Changer messes it up with some newer release. The bookmarks toolbar folders are delayed coming up in 49.0 but not in 40.03 with the same version of the AddOn running.
Ninite shows the new release also now:https://ninite.com/
The check for new version thing in Firefox often misfires. It seems to work most of the time in Cyberfox. But sometimes it takes you to the wrong build. Intel instead of AMD.