From the beginning of 2009 to the beginning of 2010, Chrome's market share grew from 0.2% to 6.4%, while Firefox's market share grew from 32.1% to 32.9%. Both were eating the dying IE, whose market share slipped from 60% to 50%:
https://en.wikipedia.org/wiki/Usage_share_of_web_browsers#W3...
Which one do you use now?
I remember that when Larry Page granted the Founder's Award to Chrome, there were several TGIF questions saying "Isn't it premature? Chrome's market share is only 5%, and the vast majority of web users have barely even heard of it."
Larry's response was "In my mind, Chrome has already won," and in hindsight, this is probably what he was referring to. When a large number of users are flooding into a brand new product, even though there's already an alternative that's pretty good on the market and still growing, that usually means that the new product fills some burning need or deficiency that existing alternatives don't. That comparison will continue to hold unless competitors address it. That's why investors look so heavily at growth rates: if you're growing 15x faster than your competitors, you're probably going to end up with the whole market, given enough time.