No, it does not. Firefox still fully supports those manifest v2 handles.
Assuming it was deleted, does HN change parent comments if parent was deleted? - that's misleading.
I didn't comment on firefox at all.
It sure looks like you replied to the wrong comment by accident.
> Assuming it was deleted, does HN change parent comments if parent was deleted? - that's misleading."
That's not possible as far as i know; What is possible, is that the original commenter EDITED their comment to a different text, soon after they posted it.