A second point in rebuttal of John Gruber's claims is the difference in nature between Mozilla as an organization and Apple and Google. Mozilla is a non-profit whose sole goal is the advocacy of web standards and technologies. They are not driven by commercial goals as are Apple and Google. They do a lot of good work in the area of developer education and have built up a strong community of followers who believe in the importance of advancing the web as an open platform that accessible to all. Whilst Firefox continues to improve in performance, it also continues to expand onto new platforms. Firefox OS will launch in Brazil later this year and for many it will be their first experience of the web. iPhones are extremely expensive in Brazil and Firefox OS phones will will priced and specced to be affordable. Think of how exciting an experience it was to use your smartphone for the first time. Now Mozilla will be helping bring that experience and all the benefits that derive from it to people for whom the experience would otherwise be unavailable.
I've talked for long enough. I hope that this article might shine some light on how important it is to continue to have a healthy competition in the browser market.