Mozilla Firefox Developer Edition, Portable 153b1 (web browser) Released (opens in new tab)

A new version of Mozilla Firefox® Developer Edition has been released. It's the developer's edition of the Mozilla Firefox web browser bundled with a PortableApps.com Launcher as a portable app, so you can do web development on the go. And it's open source and completely free. Mozilla®, Firefox® and the Firefox logo are registered trademarks of the Mozilla Foundation and used