September 15th, 2024

What Firefox trains are we in?

Firefox 115 is in the ESR phase, 130 is the current stable release, 131 will release on October 1, and the Beta and Nightly versions are at 132.

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Firefox is currently in several development stages, referred to as "trains." The current versions are as follows: Firefox 115 is in the Extended Support Release (ESR) phase, while Firefox 130 is the latest stable release. Firefox 131 is set to be released on October 1, and the Beta version is at 132, with the Nightly version also at 132. The next merge day for updates is scheduled for September 30, and all dates are expressed in the UTC timezone.

- Firefox 115 is in the ESR phase.

- Firefox 130 is the current stable release.

- Firefox 131 will be released on October 1.

- The Beta version is at 132.

- The next merge day is September 30.

Firefox 128

Firefox version 128.0, released on July 9, 2024, brings text translation, personalized search, improved data clearing, streaming in Private Browsing, Privacy Preserving Attribution API, enhanced audio for macOS, security fixes, rendering improvements, developer enhancements, and community contributions. Older Windows and macOS users are advised to switch to Firefox ESR for ongoing support.

Manifest V3 updates landed in Firefox 128

Firefox 128 introduces Manifest V3 updates for cross-browser compatibility, focusing on content scripts and scripting API improvements. Deprecated Web API events must be removed before Firefox 131. MV3 APIs are backported to MV2 for easier transition. Android permissions UI enhances optional permissions control.

Firefox 129.0

Firefox 129.0, released on August 6, 2024, features enhanced Reader View, a new Theme menu, improved security with HTTPS, and discontinued support for older operating systems, highlighting community contributions.

Firefox Sidebar and Vertical tabs: try them out in Nightly Firefox Labs 131

Mozilla has launched vertical tabs and a sidebar in Firefox Nightly 131, enhancing browsing efficiency. Users can enable these features via Firefox Labs, and feedback is encouraged for further improvements.

Firefox 103

Firefox 130.0, released on September 3, 2024, features text translation, an AI Chatbot sidebar, local weather updates for U.S. and Canadian users, security fixes, and new language support.

8 comments

By @gkoberger - 5 months

If you're curious what this means... years ago, Firefox took forever to hit 3.6, and the decision was made (mirroring Chrome) that releases would switch from "release when everything is done" to "the trains always run on time", where the release would go out at a predetermined time and anything that was ready would make it.

Mozilla also has a habit of simple question-based domains, such as "arewefastyet.com", for tracking progress.

By @captn3m0 - 5 months

Few related things I had to track down about this site recently:

1. This is an official Mozilla site.

2. Source is at https://github.com/mozilla/releases_insights, under MPL-2.0

3. Thanks to Pascal Chevrel for creating and maintaining this. https://whattrainisitnow.com/humans.txt

As far as I can tell, this is the only official page that documents Firefox 115 ESR being extended for Windows 7-8.1 and macOS 10.12-10.14 up to March 2025.

By @sdk- - 5 months

There's also a nice website to see what landed in a specific Nightly build https://mrotherguy.github.io/fx-nightly-changelog/

By @francispauli - 5 months

I finally gave up on firefox a year ago, after being a lifetime user. I can live with it being slightly slower than other browsers but it had strange hangs and very slow loading sometimes that made me switch and didn't find in other browsers. It could be an extension, that specific about:config setting or sometinhg else but i switched to have a browser that doesn't require me troubleshoot this stuff.

By @butz - 5 months

First time I hear about "train" analogy in release management. Interesting if someone is going to build this visualisation with actual animated train models and tracks ;)

By @anorangecat - 5 months

Which of these trains is for the developer edition of firefox?