Comment 57 for bug 572074

AFAIK, there are currently two ways to open a new tab with a typed URL using keyboard shortcuts:
"Ctrl-T" which is the equivalent of clicking the new tab icon, and "Alt-Enter" in the location bar.

The both are different but kind of duplicate ways to achieve the same purpose. And regarding to my fervent need to open a new tab next to the current, I propose to let "Alt-Enter" do this job. Moreover, it's natural to regard a new tab opened by Alt-Enter as a related tab to the current. Thus it's probably should be included in the realm of "browser.tabs.insertRelatedAfterCurrent".