First is that both Jefferson and Stafford recognize the blitzing corner.
Second is that Jefferson makes the adjustment but also doesn't get too deep. One step deeper and it's an interception.
Third is that Stafford is able to throw accurately from a weird angle and still with enough on it to get there quickly enough.
Fourth is that Jefferson is a hands catcher who reaches out and snatches the ball an instant before the DB can arrive which could have easily turned into a pick 6.
Fifth is that Jefferson instantly turns on the jets and stays along the sideline both protecting the ball and getting good yards to advance the rock.

Jefferson is turning into a really good WR that could be the #2 WR on many (most?) NFL squads. But, wow, does he have good teachers and role models to pattern himself after and learn. Hope he understands what a fortunate situation he's in.