Case Study: Mozilla achieves 15.4% higher conversions and 10M additional Firefox downloads per year with SiteSpect

Mozilla Optimizes Web Site Content and Performance through Multivariate Testing

Mozilla wanted to make website testing and optimization an ongoing priority, addressing both creative content and page-load performance to boost Firefox engagement and downloads. After limited success with prior solutions, the team needed a non-intrusive, easy-to-deploy testing platform that wouldn’t require JavaScript tagging or heavy IT involvement.

Using SiteSpect’s platform to run concurrent multivariate and A/B tests, Mozilla saw immediate gains: two early A/B tests increased engagement by 33% on the First Run page and over 50% on the What’s New page. A 32‑variant multivariate test showed a simpler page lifted conversions 2.3% (about 1.7 million extra downloads/year), and a streamlined, faster page cut load time by 2.2 seconds and raised conversions 15.4% (about 10 million extra downloads/year, with a 27.6% lift for IE users).

Mozilla

Justin Fitzhugh

Senior Director of Engineering Operations