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Stefan Judis Web Development

Web Weekly #199 Web Weekly #198 Web Weekly #197 Michelle Barker on Stage Fright Web Weekly #196 Escape from Average Web Weekly #195 Web Weekly #194 Web Weekly #193 Web Weekly #192 Web Weekly #191 Web Weekly #190 Web Weekly #189 Web Weekly #188 Intl can localize units, too! The scope of type guards and assertion functions Web Weekly #187 Web Weekly #186 Web Weekly #185 New lines are removed from WHATWG URLs Web Weekly #184 Nobody owes you anything How to scale elements and their layout with CSS "zoom" Notes on relying on the ARIA Authoring Practices Guide Web Weekly #183 Web Weekly #182 How to style the found search / "find in page" substrings Web Weekly #181 Web Weekly #180 ARIA roles can remove their children’s semantics
Firefox DevTools hides unreferenced CSS variables
Stefan Judis · 2026-01-10 · via Stefan Judis Web Development

Here's a quick and handy addition to the Firefox DevTools.

Whenever you debug CSS that's full of CSS variables, it becomes annoyingly hard to parse everything going on in the DevTools because the custom properties are cluttering :root or * or whatever.

Chrome DevTools with open CSS panel showing tons of unused custom properties.

Firefox 145 (released Nov 11, 2025) now added a tiny adjustment that helps out massively.

Firefox DevTools hiding "52 unused CSS properties".

Love it!