Blame Chuck, not Jamie. It is commented out because it has never been implemented efficiently -- its current implementation is quadratic on large files, which is very bad. By the way, the history of Jamie's life at Netscape is spelled out in excruciating detail in a book called Speeding the Net that is about to come out. Here is a random quote: In the summer of 1989, he followed a girlfriend out to Berkeley and found a Lisp-related job on campus before moving on to Lucid, in Menlo Park, which sold Lisp compilers. But a few months after he got there, Zawinski was forced to come down and peddle himself as a C++ programmer: Lisp, archaic and beautiful as ancient Greek, was dying as a language. It broke his heart. "Leaving Lisp to do work on C was like going to work for the Peace Corps." Mediocrity, he was coming to learn, has a better chance for survival than perfection. (A footnote to history: a lot of Lisp, as it turns out, lives on in the programming pidgin language known as Java.) SL Baur wrote: -- This message composed using voice recognition software and foot pedals. (No keyboards were harmed while composing this message.)