1. Open the new console frontend 2. Enter new Set([0,1,2,3,4,5,6,7,8,9,10]) 3. Not all the entries fit in the preview, so expand the object Result: object inspector does not show the Set entries.
This is tracked at https://github.com/devtools-html/devtools-core/issues/494
Marking this as dupe since all the necessary work will happen in Github and in Bug 1380709.