Mozilla developer Cameron McCormack landed patches to fix bug 77999, which was filed more than 14 years ago. These patches enable sharing of CSS-related data. They also add data structures that share the results of cascading user agent style sheets. This improvement is on track to make it into Firefox 41, which is scheduled for release on September 22, 2015. With these patches applied Firefox with AdBlock Plus used about 90 MiB less physical memory, a reduction of over 10%. For example, memory usage dropped by 3.62 MiB per document on a Vim Color Scheme Test.”]