"One example is to use the browser as a very simple PhotoShop," said Shaver. "[Editing an image requires] things that, for each step, takes the better part of a second. That's not a great user experience. But [with TraceMonkey], now you have something that comes close to interactive performance."
Shreopfer posted a video that showed side-by-side comparisons between Firefox 3.0 and Firefox 3.1 with TraceMonkey on his blog Friday. Users can also run the simple application themselves using Firefox 3.0 or the latest version of 3.1.
Mozilla has tentatively set the ship date of a finished Firefox 3.1 for late this year or early 2009.
TraceMonkey is based on a technique developed at University of California -- Irvine called "trace trees," and builds on code and ideas shared with the open-source Tamarin Tracing project. Shaver credited Eich; Andreas Gal, a project scientist at UC Irvine; David Anderson, a summer intern; and others for their work on the fast-track project.