[uMap] Editing a marker icon symbol no longer works

[Lucio Chiappetti]

Hello,
       since a couple of days the editing of the "icon symbol" of an 
existing or new marker no longer works with browser Pale Moon.

Before the marker icon symbol editing panel offered a choice of Recent/ 
Symbol/ Emoji&Character/ URL/  (I usually chose the third and typed a 
character or string)

Now on Pale Moon it offers just a change button and a Search... panel.

Apparently on chrome it works the old way
On Pale Moon error console there are no errors.

I have scrrenshots but I am not suere they are allowed on the mailing 
list.

It would be appreciated if operation with Pale Moon could be restored, I 
definitely prefer to use such browser.

Thanks