[Koha] Field 773 $t not editable in any framework

[Michael Kuhn]

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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