«...That said, one of the biggest questions with JIT compilation of JavaScript that I've had for months is, "How are we going to debug JavaScript now?"...» --

"Prism 0.9 has finally been released. [...] The big news for this release is Prism for Firefox, a full blown Prism and a Firefox extension all in one. This means that you can now easily “make” web applications directly from Firefox. In addition, Prism now uses Firefox as its runtime, so you don’t need to download the XULRunner runtime..."

"...he's working on a 'JavaScript environment in Emacs-Lisp, with two goals: (1) create a world-class JavaScript IDE for Emacs, and (2) permit writing Emacs extensions in JavaScript' ..."

"I've recently switched to Conkeror as my primary browser. It started life as a Firefox extension, but nowadays it's a standalone app built on top of Mozilla's xulrunner, so it uses the Gecko rendering engine.

Firefox 4 is the fastest Firefox yet. With dramatic speed and performance advancements across the board, Firefox is between two and six times faster than previous releases. Major enhancements to the JavaScript engine make everything from startup time to page load speed to graphics and JavaScript performance screaming fast in Firefox.

"There has been some discussion about shipping it with Firefox 3, but I think that has been put behind in favor of an extension to Firefox so we can follow our own timeline. Luckily, FF3 has a new neat feature that allow you to pass the -app parameter to run a xul application. Nifty..."

"JavaScript 1.8 is scheduled to ship as part of Gecko 1.9 (which will be incorporated into Firefox 3). This is a less substantial update than JavaScript 1.7, but does have some updates to track progress toward ECMAScript 4/JavaScript 2..."

FireSSH is a free, cross-platform SSH terminal client for Mozilla Firefox. Written entirely in Javascript!, if you are for example under windows and you want to use ssh, the firesshbest is to install this firefox extension.

"Ejacs is an Ecma-262 compliant JavaScript interpreter written entirely in Emacs Lisp. It should work in GNU Emacs versions 22 and higher..." via http://code.google.com/p/ejacs/