See the "Note" here: https://www.zotero.org/support/getting_stuff_into_your_library#manually_adding_and_editing_items

I agree with @NMonteix. There many ways to add an entry to Zotero, including the manual way, and Zotero should respect user's decision to add the item *manually*. If the user wants to save from a webpage (or use any other way), he surely can.

It's still _possible_ to add new Webpage item manually, but is not practical and requires the user to read that note in some documentation page, which there's no need to exist in the first place. Just because something is "easier" in developer's perspective, does not mean that it is the preferred way for everyone.

PLEASE add this item back to the menu. It's much simpler to understand that way, with less exceptional cases.