We're sorry to hear about this. Could you please let us know if you're seeing any error messages when the app crashes? Which browser are you using? Have you tried using the other suggested browsers (Safari, Microsoft Edge, and Google Chrome) to see if it makes a difference?
Such problems can also be fixed by clearing the browser's cache and cookies. Please check this link for more information on how to clear cache and cookies: https://support.google.com/accounts/answer/32050
Also, having multiple tabs open will use more memory. Closing unwanted browser tabs will free up memory and improve performance.