No specific info about version 2.0. Please visit the main page of Firebug on Software Informer.
Utilu IE Collection contains multiple IE versions: easy to install and to run.
UseJump is a web browser based on the WebKit rendering engine.
PerfectPixel is a free add-on for web developers and markup designers.
Companion.JS is a JavaScript debugger for Internet Explorer.
This application imports HTTP Tracing/Archive Logs (HTTPA).
This plugin is for local web development on a machine with two monitors.