Massive performance improvements, @starting-style support and accessibility fixes

CSS registered properties, relative color syntax, specificity and important Debugger fixes!

Faster CSS tokenization, bug fixes and other improvements, see what’s new in Firefox DevTools 127

Faster Inspector Rules view, state for custom elements and more, see what’s new in Firefox 126

JS-free dynamic popups, nice performance boost, sourcemap management and bug fixes, read what’s new in DevTools in Firefox 125

DevTools at maximum performance, CSS variables, file requests and more in Firefox 124

Useful sourcemap information in the Debugger and a lot of important fixes, check out what’s new in DevTools in 123

Improved accessibility, $ and $$ eager evaluation, unload event listeners and various fixes, read what’s new in DevTools in Firefox 122

:has() warnings, more discoverable element relations, better debugger and accessibility improvements