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The Firefox Dev Tools team released an upgrade to the debugger’s source map support. It lets you inspect the code that you actually wrote. Combined with the ongoing work to provide first-class JS framework support across all Firefox devtools, these advances boost productivity for web app developers working in frameworks like React, Angular, and Ember and with modern tools like Webpack, Babel, and PostCSS.
Debugger.html is an open source project, built on top of React and Redux, that functions as a standalone debugger for Firefox, Chrome and Node. The debugger is also being integrated into the Firefox Developer Tools offering. Currently it is available in the Firefox 53 release behind the devtools.debugger.new-debugger-frontend preference.