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Chrome auto-updates, so there are almost no users of old versions of Chrome. http://arstechnica.com/information-technology/2012/06/may-br...

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Well, about 12% of Chrome page views are from old versions so "almost no users" is a bit of a myth or exaggeration. But it's definitely a smaller proportion than other browsers.

Firefox also auto-updates, but has a longer tail of users from old versions since it's been around longer and had a more obtrusive update process until recently. Currently about 32% of Firefox page views come from old versions, but this is decreasing steadily now that Firefox 3.6 users are being auto-updated to the current release channel, and now that updates are more "silent."

Stats are based on http://gs.statcounter.com/#browser_version-ww-monthly-201206... and http://gs.statcounter.com/#browser-ww-monthly-201206-201206-...

SPDY has been around since Chrome 10, so only 5% of Chrome users are older than that.

Once SPDYv3 is enabled in a release channel the Chrome installations which only support an outdated SPDY version will rise suddenly if the current update trend is not reversed in a future version.

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