His plan sounds a lot like Robert Zubrin's Mars Direct plan detailed in The Case for Mars
Those are just build numbers. Pick the biggest number for the latest version. As of right now, this is the latest version:
You can download Chromium here: http://build.chromium.org/buildbot/snapshots/sub-rel-mac/
It's roughly competitive with Python 3
The article is talking about online market share, i.e. percentage of browsers going to websites, not percentage of new computers purchased in the marketplace.
I work for an e-commerce site that seems to track the average pretty closely. Windows as a whole is at 91.09% of our browsers, of which 74.09% is XP and 23.51% is Vista. Mac is at 7.98%. Last November, that number was 5.87%, which is a 35.9% increase in total Mac browsers in 1 year! In the same period, Linux has gone from 0.41% to 0.62%, an increase of about 51.2%