Edit block doesn't work in IE/FF

Description

Go to https://pi-integrated.cluster38.e-active.nl/?integrated_website_edit=0

Click on edit

Edit a block

The block doesn't open in IE and FF, it works in Chrome

Technical tasks

None

Deployment actions

None

Assignee

Unassigned

External issue ID

None

Client

Integrated Marijn

Min. hours

None

Dev hour estimate

None

Epic Link

Fix versions

Configure