Although the situation is much better than it used to be, Explorer and Navigator still have some differences that can make the same page which renders ideally in one look like garbage on the other. Four reasons why you should have two browsers 1. Sometimes one browser will stop locating Web pages, even if all is well with your Internet connection and your ISP's DNS server. Rather than waste time disconnecting from the Net, closing all your programs, rebooting, and reconnecting, many times you can close one browser and the other one will work well. You can share.
Competition is good.
A world with one vendor who controls everything is a world without innovation. Each version of each browser leapfrogs over the advances in the competitor's most recent version. Navigator 4 was better than Explorer 3, Explorer 5 is better than Navigator 4, and so on. Four reasons why one browser is enough 1. This is wasting time, not working.