JägerMonkey is a method JIT compiler based on the Nitro assembler built for Apple’s open-source WebKit project, the same assembler used by the Google Chrome and Apple Safari browsers. TraceMonkey will continue to convert code loops into assembly code, but when this isn't possible, JägerMonkey will kick in, converting entire methods to assembly code.
JägerMonkey borrows the Nitro assembler from WebKit
The JägerMonkey preview builds are available for Linux, Windows, and Mac, including 64-bit Linux and 64-bit Mac. ®