Install tampermonkey and then add this script to it. You will always see the roll in your chat, but other people will only see if average roll is above 10. Try it by joining the same game from another browser.

Dont cheat in real games, or do, I'm not your mom.

websocket intercept taken from: https://stackoverflow.com/questions/31181651/inspecting-websocket-frames-in-an-undetectable-way/31182643#31182643