version: '3.3'
services:
  firefox:
    ports:
        - '6902:6901' #change 6901 as necessary. eg. '6901:6901', '6902:6901', '6903:6901'
    environment:
        - VNC_PW=password #change as desired
    shm_size: '512m' #change per your needs. eg. '512m', '1gb', '2gb'
    image: 'kasmweb/firefox:1.14.0' #change the image to your desired image
    restart: unless-stopped