A/B test results for the Firefox download button wording

Note: This post is over 4 years old. It was first published in November 2008

Mozilla’s blog of metrics has released the results of a small A/B test they ran recently. Which of the following buttons got the best clickthrough rate on the “customise firefox” page, and by how much? One of them was significantly less effective to a 99.85% confidence level.

Recipe A

Recipe B

You can find the answer and more information over at the blog of metrics.