Why would an IDE have a separate process for another window? At least, Idea does it right (iirc). As for FF, I have 47 windows opened, but 11 processes running

Why would an IDE have a separate process for another window? At least, Idea does it right (iirc). As for FF, I have 47 windows opened, but 11 processes running—one of which is a ‘master’ process. Meanwhile tabs that are in one window can still run in multiple processes.