Greasemonkey Usage by Firefox Version, July 2011

I wrote a very similar post three months ago, but there's been a lot of real motion along Mozilla's fast release track since then. It's worth revisiting these numbers:Click for a larger image, or browse the data in Google Docs, with a larger view and a line chart as well.

This stacked area chart makes a few of trends obvious: Firefox 4 became very popular over its short life, and Firefox 5 is quickly replacing it. But also: Firefox 3.6 is definitely still kicking, at the second most common browser over the past week. Here's some data; the average daily usage for each version over the past week:

• 5.0 1,589,647
• 3.6 798,062
• 4.0 461,349
• 3.0 150,314
• 3.5 117,740
• 2.0 13,144
• 6.0 2,596
• 7.0 1,990
• 1.5 392

Or: Version 3.x (1,066,116) is still one third of total usage (3,135,233). And even if 4.0 is dropping quickly, right now it's still almost a quarter of the total post-3 users.