It was Toffoli's seventh goal in the last eight games, while Suzuki extended his point streak to six games on the play.
Defenseman Jeff Petry also collected a helper on the sequence, extending his point streak to five games.
With Toffoli's snipe, the Canadiens have scored on the power play in each of their last three contests.
The always dangerous Auston Matthews gave the Maple Leafs a 2-1 lead with 2:39 remaining in the period, tipping a point shot from defenseman Jake Muzzin past Allen.