Editora 0.10.0. Archived, so links from that release keep working. Read the 0.17.0 page →
HTTP: Open Response in Editor Tab
http.openResponseInTab Open the selected response body in a new editor tab.
How to run it
Open the command palette (M-x in the Emacs keymap) and search for HTTP: Open Response in Editor Tab, then press Enter. It has no default keybinding, but you can bind one in Settings → Keymaps.