It's like 3 or so lines in userscript if you really need it. In general case most modern browsers allow an alternate way of opening a tab in background, e.g. m

It's like 3 or so lines in userscript if you really need it. In general case most modern browsers allow an alternate way of opening a tab in background, e.g. middle mouse button click, so this gives users a method of control over what they want hyperlinks to do, but not the other way as there's no easy way to undo target=_blank. It's usually considered bad UX practice to do so by default unless clicking a hyperlink can cause irreversible state change like in some cases of autopaging.