The Form Manager site cannot be opened using Microsoft Edge - the swirl appears and application hangs.

Steps to reproduce:
1. Using Edge, login as admin
2. Navigate to "Form Manager" site (Content -> Form Manager)

Expected result:
Form Manager site opens

Actual result:
Swirl appears. Nothing else happens.

The following error is visible in console:

SCRIPT438: Object doesn't support property or method 'append'
_ezcombo (93,17)