only apps.chrome working, apps.firefox & apps.edge is not working

apps.chrome opens link in chrome & works fine `await open('https://google.com', { app: { name: apps.chrome } });` but apps.firefox & apps.edge is not working even though they are already installed. When changed name to below code it works for respective browser i.e ( chrome, msedge, fireforx, iexplore) `await open('https://google.com', { app: { name: 'firefox' } });` I need to use apps.firefox & apps.edge for cross platform compatibility.