Duplicate FE-Users on save-and-close
In IE11, with a single click on save and close, it will create two fe_users. The second one with the usual zero at the end.
This only happens in IE11 (and possibly other IE versions I couldn't test).
Also works normal if I only hit the save button. But the error happens if I open the save-dropdown, and just click on save instead of one in the dropdown.
Possible related issue: https://forge.typo3.org/issues/77942