The latter opens Each and every backlink in a fresh tab/window. The previous (lacking quotes) opens the initial backlink you simply click in a single new tab/window, then overwrites that same tab/window with Each and every subsequent backlink you simply click (that is named also While using the lacking estimates). https://share.evernote.com/note/5f669f7e-71ee-7be2-7b5a-79a0c34e50c6