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Firefox 149 is out now, and adds bunch of new web platform features, like 🎉 The CloseWatcher API 🎉 popover=hint (although I'm concerned about the spec'd behaviour) 🎉 hasUAVisualTransition on PopStateEvent 🎉 font-family: math 🎉 The CSP reporting API And more! developer.mozilla.org/en-US/docs/M...

developer.mozilla.orgFirefox 149 release notes for developers (Stable) - Mozilla | MDNThis article provides information about the changes in Firefox 149 that affect developers. Firefox 149 was released on March 24, 2026.

Firefox for Web Developers

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In terms of popover=hint, I dug into it when scripting a video, and… I can't make sense of the behaviour at all. Here's my investigation so far if you want to follow along: github.com/whatwg/html/... & github.com/whatwg/html/...

github.compopover=hint inconsistent behavior nested vs unnested · Issue #12304 · whatwg/htmlWhat is the issue with the HTML Standard? https://random-stuff.jakearchibald.com/popover-hint/ nested-hint.mp4 (includes audio) At the top level, a popover=hint, when opened, will not close a sibli...

24/3/26, 2:47 pm1 repost10 likes

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