Ribeiro had a goal and two assists and Montreal scored three power-play goals in a 4-1 victory over the Pittsburgh Penguins on Thursday night.
"We're trying to focus on shooting more on the net," Ribeiro said. "Last year we stood around a lot in the box, but this year he wants more movement, and when we have a shot, don't miss it. But I think the [penalty killing] was the main thing. We had a lot of penalties, and they did the job."
The Canadiens extended their season-opening winning streak to three games, while the Penguins slipped to 0-2-1.
Ribeiro set up a goal by Richard Zednik late in the second.
"That was probably the turning point right there," Julien said. "When you score with 1.5 seconds left like that, it's got to hurt the opposing team."
Ribeiro also assisted on Jason Ward's power-play goal that gave Montreal a 3-1 lead at 9:19 of the third before scoring the Canadiens' third power-play goal two minutes later for his third goal in four games.
Theodore has allowed just two goals in three games, and Montreal has outscored its opponents 12-2.
"I thought in the second period, Pittsburgh dominated a little bit, but we were able to get that big goal in the end," Theodore said.
Martin Straka scored Pittsburgh's lone goal on a power play in the second. The Penguins went 1-for-7 with the man advantage and have scored just twice in 13 opportunities overall.
"I think we played pretty well the whole game long, and it's a tough loss," Straka said. "We got a lot of good chances in the second period and we couldn't put them in, and in the third we had a couple of breakdowns and they put them in, and that was the difference in the game."
Pittsburgh is winless in Montreal since Jan. 31, 1999, going 0-7-2 at the Bell Centre in that span.
"You've got to give that team credit," Julien said. "That's a young team that's supposed to be rebuilding, but they've got some speed up front and they gave us some trouble."
Markov got credit for his first goal on a power play late in the first. Michael Ryder and Yanic Perreault drew assists when the defenseman's shot struck Pittsburgh defender Nolan Baumgartner before deflecting off Caron's leg and into the net at 18:57.
Zednik scored with 1.5 seconds left in the second, beating goalie Sebastien Caron from the slot with a shot through the legs to break a 1-1 tie.
"The second goal really hurt us," Lemieux said. "With less than two seconds left, it changed the outlook of the game, and they got a couple of power-play goals in the third, so we've got to get better at special teams."
Penguins D Brooks Orpik returned after serving a one-game suspension Saturday for kneeing Los Angeles' Tim Gleason in Pittsburgh's season-opening 3-0 loss on Oct. 10. ... Theodore drew a gasp from the crowd early in the first when his clearing attempt struck the side of the net. ... LW Steve Begin made his debut with the Canadiens. Begin had been sidelined by a strained shoulder since he was acquired from Buffalo in the Oct. 3 waiver draft.