A big cleanup of the code was announced back in 2006: http://weblogs.mozillazine.org/roadmap/archives/2006/10/mozilla_2.html http://weblogs.mozillazine.org/road

A big cleanup of the code was announced back in 2006: http://weblogs.mozillazine.org/roadmap/archives/2006/10/mozilla_2.html http://weblogs.mozillazine.org/roadmap/archives/2006/10/mozi... They've been working on it since, although I think it has evolved over the past three-and-a-half years. They've got a bunch of automated tools and subprojects to help move things forward.