Here is who played how much against the Browns. Snap counts are from Pro Football Focus.
Offense: 78 snaps
Quarterback: Kirk Cousins 78
Offensive line: Trent Williams, Kory Lichtensteiger, Chris Chester all played 78 snaps; Will Montgomery 72, Jordan Black 44, Tyler Polumbus 34, Maurice Hurt 6
Polumbus went out of the game late in the first half with a concussion and Black played well filling in for him. Montgomery wen out late with a knee injury with Lichtensteiger shuffling to center and Hurt coming in at left guard. Those were the first snaps missed by any offensive linemen since Williams was out for part of the Bengals game in Week 3.