Linked by Thom Holwerda on Thu 13th Mar 2008 20:41 UTC, submitted by RJop
"While Firefox 2 used less memory than it's predecessor, Firefox 1.5, we intentionally restricted the number of changes to the Gecko platform (Gecko 1.8.1 was only slightly different than Gecko 1.8) on which Firefox was built. However, while the majority of people were working on Firefox 2/Gecko 1.8.1, others of us were already ripping into the platform that Firefox 3 was to be built on: Gecko 1.9. We've made more significant changes to the platform than I can count, including many to reduce our memory footprint. The result has been dramatic."