[Touche]

I wish I could find a "market share over time" chart but I can't. Anyways, IIRC I don't believe Chrome is still taking (much) aware from Firefox. They did for a long time but then flattened. Recently Chrome has dipped a little and Firefox is up: http://thenextweb.com/insider/2013/11/01/ie11-takes-1-49-mar...

[riquito]

Arstechnica has always nice plots based on netmarketshare.com Here is a recent article:

http://arstechnica.com/information-technology/2013/11/intern...

[deelowe]

Does this count? http://gs.statcounter.com/

[jmpe]

w3schools is relatively small but their stats are good:

http://www.w3schools.com/browsers/browsers_stats.asp

And there's also Google trends.