Falkirk earned back-to-back wins to start 2026 as an outstanding Finn Yeats' finish and Calvin Miller strike condemned St Mirren to a third straight Scottish Premiership defeat.
Victory gives John McGlynn's side a five-point cushion inside the top six in what has been a hugely-impressive, long-awaited return to Scotland's top flight.
League Cup winners St Mirren remain in 10th place - albeit with one or two games in hand - having now won just twice in 14 league matches.
Stephen Robinson's injury-hit side are 12 points behind a Falkirk side who have won five away games in the top flight and breached the 30-point mark after 21 games.
It was a game lacking in quality in the final third in the opening period.
Falkirk came closest when Dylan Tait struck from the edge of the box, it deflected, looped high and clipped the crossbar.
They seized the initiative after the break, though. Yeats produced a stunning finish to break the deadlock when Shamal George raced from his line to challenge Miller.
The ball broke perfectly for the young midfielder and he showed composure to lift the ball perfectly into the net to the glee of Falkirk fans behind that goal.
A crucial second followed shortly after when Miller got the break of the ball on the edge of the box, turned, and slammed home past George.
From there a comeback looked unlikely as the visitors manage to control much of the play to further enhance an already excellent season.