@FirefoxDevTools

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Built for you to design, code, test, refine a better web for everybody. Follow us for announcements, tips, sneak peeks, and more!
Bloghttps://fxdx.dev/
Documentationhttps://firefox-source-docs.mozilla.org/devtools-user/
Contributehttps://firefox-source-docs.mozilla.org/devtools/
FirefoxDevToolsDec 2

Another API proposal from TPAC: CSS routes and navigation queries, meaning less JavaScript is needed for view transitions!

https://drafts.csswg.org/css-navigation-1/

https://github.com/w3c/csswg-drafts/issues/8685#issue-1653949919

FirefoxDevToolsDec 1

We have Custom Elements, but do we also need Custom Attributes?

This was discussed at TPAC. Is it something you'd like on the platform?

http://github.com/WICG/webcomponents/issues/1029

FirefoxDevToolsNov 20

Out-of-order HTML patching, another proposal from TPAC, lets HTML be presented non-linearly, and a single file can update multiple parts of the page.

Would this feature be useful to you?

FirefoxDevToolsNov 19
Two-phase view transitions, for faster cross-document transitions, were presented at TPAC last week. Here's a quick 3min overview…
FirefoxDevToolsNov 19
streamHTMLUnsafe() was presented at TPAC last week. Finally, an API that lets you easily use the streaming HTML parser from JavaScript! Here's a quick overview:
FirefoxDevToolsOct 21

New in Firefox nightly (146.0a1 2025-10-19): large lists of unused CSS custom properties are collapsed by default.

This not only reduces clutter, it also massively speeds up the rendering of the inspector panel in some cases.