Scripting extension to Firefox. Adds direct Javascript plus extensions & a macro recorder. Seems to lack a built in security option. Manipulates the DOM object once rendered in FF. Complements Greasemonkey
See also: CoScripter and iMacros
This JavaScript utility allows you to interactively browse the Document Object Model representation of a page. Its designed to help developers in finding the various objects, properties and values associated with elements and other objects in an web page.