firefox-57.0.1-1.fc27.x86_64 -

[Bob Goodwin]

Upon booting this morning I found that I had been updated to 
firefox-57.0.1-1.fc27.x86_64. I have been keeping Firefox downgraded [to 
version 52 whatever] with dnf upgrade --exclude firefox. Dnf now refuses 
to downgrade below version 57.

Am I really stuck with this or is there a way around it?

Bob