Marshall caught six passes for 100 yards in the victory.
The league fined Marshall $10,500 in October after the Pro Bowler wore lime green shoes during a home game against the New York Giants to promote Mental Health Awareness Week.
Marshall announced in advance of the Giants game that he would violate the NFL's Uniform and Equipment Rules and vowed to match the fine amount with a donation to charity.
He and fellow receiver Earl Bennett were also fined for wearing orange cleats in 2012.
On the season, Marshall leads the Bears with 84 receptions for 1,090 yards and nine touchdowns.
In other news, cornerback Zack Bowman had his $15,750 horse-collar fine rescinded by the league, according to a source. Bowman received the fine after he was flagged for a horse-collar tackle in the Bears' 23-20 overtime win over the Baltimore Ravens on Nov. 17.
Other fines from Week 14 include:
• Denver Broncos linebacker Von Miller received the biggest fine of the week, getting docked $25,000 for a helmet-to-helmet hit on Tennessee Titans quarterback Ryan Fitzpatrick. Miller popped Fitzpatrick in the helmet with his facemask, resulting in a penalty that led to a touchdown for the Titans in Tennessee's 51-28 loss.
• Cowboys defensive back Orlando Scandrick was fined $21,000 for a helmet-to-helmet hit on Marshall, who was deemed a defenseless player on the play.
• Dallas defensive end George Selvie was docked $15,750 for roughing the passer against the Bears.
• Pittsburgh Steelers center Cody Wallace was fined $15,000 for unnecessary roughness for hitting Randy Starks of the Miami Dolphins in the groin area. Wallace was fined an additional $10,000 for a late hit in the fourth quarter.
• Oakland's Lamarr Houston was fined $7,875 for a late hit on Jets quarterback Geno Smith, while Arizona's Darnell Dockett must pay the same amount for unnecessarily stepping on the hand of St. Louis' Chris Williams.
Information from ESPN.com Steelers reporter Scott Brown, Bills reporter Mike Rodak and The Associated Press was used in this report.