Mozilla Firefox

The latest Mozilla Firefox version, its release date and the next scheduled releases, from Mozilla’s own release pages.

Current stable version: 158.0
Released: October 13, 2026
Next version: 159
Next release: October 27, 2026
Engine: Gecko
Release cadence: every 2 weeks (moved from every 4 weeks starting with Firefox 155; described by Mozilla as an experiment)

The current stable version of Mozilla Firefox is 158.0, released on 13 October 2026. The next stable release, Mozilla Firefox 159, is scheduled for 27 October 2026.

What is new in Mozilla Firefox 158.0:

JPEG XL image support, and more accessible PDFs when saving a page as PDF
Smart Window can suggest form data from relevant open tabs and saved autofill data (progressive rollout)
Translations add Albanian, Belarusian and Filipino; New Tab keeps a library of custom wallpapers

Release cadence. Every 2 weeks (moved from every 4 weeks starting with Firefox 155; described by Mozilla as an experiment).

Firefox ESR. ESR 153 (153.5.0 on 2026-10-13); ESR 115 for Windows 7–8.1 and macOS 10.12–10.14, supported until 2027-03. ESR 140 is no longer listed among supported ESR branches.

Questions

What is the latest version of Mozilla Firefox?

Mozilla Firefox 158.0, released on 13 October 2026.

When is the next Mozilla Firefox release?

Mozilla Firefox 159: 27 October 2026; Mozilla Firefox 160: 10 November 2026; Mozilla Firefox 161: 24 November 2026; Mozilla Firefox 162: 8 December 2026.

Compare all browsers in the browser release tracker.

Maker: Mozilla
Upcoming releases: Version Stable date Source
159 2026-10-27 https://whattrainisitnow.com/calendar/
160 2026-11-10 https://whattrainisitnow.com/calendar/
161 2026-11-24 https://whattrainisitnow.com/calendar/
162 2026-12-08 https://whattrainisitnow.com/calendar/
Previous major releases: Version Date
157.0 2026-09-29
156.0 2026-09-15
155.0 2026-09-01
Release notes: mozilla.org
Official schedule: whattrainisitnow.com
Last checked: October 19, 2026
Sources: Source Link
Mozilla Firefox release notes https://www.mozilla.org/en-US/firefox/158.0/releasenotes/
Firefox 158 date https://whattrainisitnow.com/release/?version=158
Firefox 157 date https://www.mozilla.org/en-US/firefox/157.0/releasenotes/
Firefox 156 date https://whattrainisitnow.com/release/?version=156
Firefox 155 date https://www.mozilla.org/en-US/firefox/155.0/releasenotes/
Cadence https://blog.mozilla.org/l10n/2026/07/23/firefox-release-changes-and-localization/
Cadence is an experiment https://groups.google.com/a/mozilla.org/g/dev-platform/c/qlaQ1YSlOP8
ESR versions and schedule https://whattrainisitnow.com/release/?version=esr
Engine https://firefox-source-docs.mozilla.org/overview/gecko.html
Upcoming releases 159-162 https://whattrainisitnow.com/calendar/

Version	Stable date	Source
159	2026-10-27	https://whattrainisitnow.com/calendar/
160	2026-11-10	https://whattrainisitnow.com/calendar/
161	2026-11-24	https://whattrainisitnow.com/calendar/
162	2026-12-08	https://whattrainisitnow.com/calendar/

Version	Date
157.0	2026-09-29
156.0	2026-09-15
155.0	2026-09-01

Source	Link
Mozilla Firefox release notes	https://www.mozilla.org/en-US/firefox/158.0/releasenotes/
Firefox 158 date	https://whattrainisitnow.com/release/?version=158
Firefox 157 date	https://www.mozilla.org/en-US/firefox/157.0/releasenotes/
Firefox 156 date	https://whattrainisitnow.com/release/?version=156
Firefox 155 date	https://www.mozilla.org/en-US/firefox/155.0/releasenotes/
Cadence	https://blog.mozilla.org/l10n/2026/07/23/firefox-release-changes-and-localization/
Cadence is an experiment	https://groups.google.com/a/mozilla.org/g/dev-platform/c/qlaQ1YSlOP8
ESR versions and schedule	https://whattrainisitnow.com/release/?version=esr
Engine	https://firefox-source-docs.mozilla.org/overview/gecko.html
Upcoming releases 159-162	https://whattrainisitnow.com/calendar/

Source: versions, release dates and upcoming releases come from each browser maker’s own release notes and official release schedules, linked under Sources on every browser’s page. Checked on 19 October 2026.