Mozilla Introduces Firefox Developer Edition

Mozilla announced that they are excited to unveil Firefox Developer Edition, the first browser created specifically for developers that integrates two powerful new features, Valence and WebIDE that improve workflow and help you debug other browsers and apps directly from within Firefox Developer Edition.

Read more: https://hacks.mozilla.org/2014/11/mozilla-introduces-the-first-browser-built-for-developers-firefox-developer-edition/