I use chrome and firefox, because sometimes websites don't work right on chrome. I mostly use FF for you tube, and chrome for main browsing. I like chrome, because it syncs with my Android phone via my google account. Though I think Firefox does basically the same thing, but with a user name and not Google Account.
I may the only member on Sysnative to use a browser offered by SRWare.net. It's called Iron and I use the x64 version. It utilizes the Chromium source code. Primary reason I started using it in 2009 is because Iron, unlike Chrome, does not data mine. I do not have a secondary browser and see no reason that I would ever have one or stop using Iron.