A retrospective look at 6.5 years of work at Mozilla on Firefox DevTools. The author progressed from software engineer to engineering manager, contributing to over 1100 bugs filed, 500 bugs fixed, and 1800 code reviews. Highlights include building major DevTools features like the Grid Inspector, Flexbox Inspector, Fonts Editor, Accessibility Inspector, Animation Inspector, and the cross-browser Compatibility sidebar, among many smaller improvements to the CSS and DOM inspection experience.
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