У вашего броузера проблема в совместимости с HTML5
How it works: No matter how many of the monitors are placed, they'll only display from a single rendered texture, meaning they'll all display the same as the last placed monitor. Also meaning that the game won't be pressured by the amount of monitors since they don't create a new rendered texture when created.
They will display only from the view of the last placed monitor.
This can be used for viewing a specific place from afar.
Link to the workshop:
https://steamcommunity.com/sharedfiles/filedetails/?id=1547087505