Another unnecessary macOS global keyboard shortcut change inspired a bad change in Firefox.
Apple hijacked ⌃↩ to open a context menu. Firefox used that to normalize input text to a .com URL.
⌘↩ in the address bar used to open a new tab. Firefox thought adding .com was more useful than opening a new tab, so moved new tab to ⌥↩, inconsistent with ⌘ + click opening a link in a new tab.