Internet Explorer 11 (IE11)
I still use ie11 primary and chrome secondary. Untill Edge gets extensions have no desire to use it
Chrome for most things. Edge for streaming video. Baidu for download manager.
Firefox is being a real dog on Build 14946;
makin some real progress with Vivaldi Version 1.5.
Chrome is my choice since it came out. In December it will be better with alot less memory issues.
Horses for courses -- like BMW vs Audi etc etc.
IE does have a debug feature so you can see what's happening when say you do a Google search and click on a Link. I'm still old fashioned enough to like Menu's and dropdowns too. My Computer isn't a "Large Mobile phone" or slab.
I don't like Edge - and it doesn't support SKY GO.
I'm tending to use Firefox more and more these days when not using SKY GO (Football etc).
I rarely logon to Windows for browsing - unless I'm also using SKY GO. Firefox on Linux with latest updates applied is vastly superior now than a few releases ago.
I'm using version shown below (Linux) --seems more than adequate.
I haven't though tried any Firefox version on Windows.
Speed is an unreliable measure anyway - a lot depends on Network performance, activity on the HOST (remote) Web site and how well the remote web site code is written.
Browser performance measurements these days are about as useful as a Chocolate Teapot.
I started with Netscape, was good (and only one then).
I tried out Vivaldi and so far I really like it. It's a nice alternative browser.