I use mainly Chrome myself but have found Firefox's devtools are a little better. I though have used in the past : IE, Safari, Opera, and a few others that aren't really well known.
Chrome or sometimes Firefox if I wanna try something new. I like chromed looks and just different aspects from fox. Both fox and chrome have add-one which I like now!
We've all heard that one, It has been known to be like that in the past but as it progressed its gotten better but I still don't use it and recommend people use google chrome..