The best browser I have worked on was the Netfront browser, but it's not a PC / Mac based browser, mainly for embedded devices.
Chrome is far better than IE, but I've not really used Firefox.
I guess IE is a lot better than the boat anchor it used to be, but I refuse to use it. The only time I use it is to download a decent browser. That's what happens when you win a lawsuit that says you can tie a browser to an OS. They have sped it up, but they still don't support things like WebGl, etc. They've always been the stick in the mud of open standards.
IE11 actually has better webgl support than Firefox. http://caniuse.com/#search=webgl
Microsoft were late to appreciating standards, but they're there with gusto recently.
Hmm. That pretty much seals it for WebGL becoming the 3d standard.
No one loves Opera? Besides I've been doing some web-site jobs from time to time, so currently I have whole list of browsers installed (different IEs on different machines, Firefox, Opera, Chrome, Konqueror, Safari, Rekonq, Epiphany and minimalistic ones Links and Lynx).
My personal favourite is though Opera.
Can you call it "better" WebGL support if IE11 only runs on Windows 8 while FireFox supports WebGL on any platform with DirectX 9-class hardware? Also, that page doesn't seem to be taking WebGL conformance results into account: https://www.khronos.org/registry/webgl/conformance-suites/1.0.2/webgl-conformance-tests.html
For the record, I'm a developer of ANGLE (https://code.google.com/p/angleproject/) and SwiftShader (http://updates.html5rocks.com/2012/02/SwiftShader-brings-software-3D-rendering-to-Chrome).
Microsoft is late to the game so I doubt their WebGL implementation will truly be better any time soon, if ever.