Giroux skated in slowly and faked the Panthers goaltender to the ice before roofing a backhander into the net during the tiebreaker's second round.
Sergei Bobrovsky made saves on Stephen Weiss and Mike Santorelli to preserve the victory for the Flyers, who entered the All-Star Game break in the Eastern Conference's fourth spot with a 29-14-5 record.
Philadelphia's Jakub Voracek and Brayden Schenn scored in regulation.
Florida goes into the break tied with Washington for first place in the Southeast Division.
Texas principal bans speaking Spanish, stirs controversy
Ron Burgundy interviews Peyton Manning on SportsCenter