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Major versions of Firefox now land every two weeks, so Firefox 155 dropped today with web platform features including: 🎉 Fully typed CSS attr() 🎉 CSS progress() 🎉 Promise.allKeyed() and allSettledKeyed() 🎉 Lots of new WebTransport stuff …And more! developer.mozilla.org/en-US/docs/M...

developer.mozilla.orgFirefox 155 release notes for developers (Stable) - Mozilla | MDNThis article provides information about the changes in Firefox 155 that affect developers. Firefox 155 was released on September 1, 2026.

Tobias Fedder

@tfedder.de

1 Sept

Releases every two weeks that's great. The question is: is it because of peer pressure?

Firefox for Web Developers

@webdevs.firefox.com

Chrome doing it definitely raised the question of doing the same, but the reason is really because it gets features and fixes from "ready to go" to Release in half the time.

1/9/26, 1:51 pm0 reposts8 likes

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