Hi Marjorie
I was the same problem and it was fault of my plugin ADBlock.
https://addons.mozilla.org/fr/firefox/addon/adblock-plus/
Try without ADblock enable.
Thank you very much for your suggestion! Yes, this did it!
I deactivated Adblock in Mozilla Firefox, this time also the "Advanced
constraints" of 773 $t could be opened (while 773 $w and all other
fields could be opened with Adblock activated).
So this means Koha is ad-friendly? I hope not. However, of course I did
reactivate Adblock.
I also made note of this in the filed bug
https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=17660
Best wishes: Michael
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