I could write emails faster if, when composing an email, the "New Message" box did not cover up the email that I am reading and wanting to respond to. There use

I could write emails faster if, when composing an email, the "New Message" box did not cover up the email that I am reading and wanting to respond to. There used to be a function to tear off the "New Message" box, but I guess that was too confusing for people? Now I have to open another browser window if I want to look at an email and compose one at the same time. I'd love to know if there is a good work around or trick to have the compose window open up in a separate window.