Just adding to this: the attack surface of a web browser is humongous compared to that of a relatively small runtime, even in 2008. In 2011 when I had a look th

Just adding to this: the attack surface of a web browser is humongous compared to that of a relatively small runtime, even in 2008. In 2011 when I had a look through the FF codebase, there were already 2 JITs for JavaScript, one which had been in for years (but I don't remember if it was in use).