Jash: JavaScript Shell

Jash: JavaScript Shell
Documentation
Firefox上面已經有firebug了, 所以這個東西還是用IE上面比較適合

Jash is a DHTML-based window that gives you command-line JavaScript access to the current browser window. With this console you can quickly debug scripts, manipulate the DOM, view the current page's objects, functions, and variables, trace the execution stack, execute arbitrary Javascript, enter new CSS (in IE, Firefox, Opera, and Safari), and much more.