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Firefox 159

Firefox 159 is the current Firefox version, released on 27 October 2026. Firefox 160 replaces it on 10 November 2026.

Released
27 Oct 2026
Released Supported until November 2026
Download Firefox 159 Official: mozilla.org · Release notes ↗
Release type
Regular release (replaced every 2 weeks)
Released
Oct 27, 2026
Next version
Firefox 160 on 10 Nov 2026
ESR
Firefox 153 ESR

What's new in Firefox 159

Scroll-driven animations

CSS and Web Animations can now follow the scroll position of a container or an element moving into view.

Fixes for uploads and memory

The file upload dialog opens in the last upload folder again, and memory no longer grows quickly with some web apps left open.

Developer tools

The Web Console lets you re-declare let, const and class variables, so snippets can be edited and re-run.

Source: Firefox 159 release notes

Release timeline

  1. 158 out 13 Oct 2026
  2. Released 27 Oct 2026
  3. Today 3 Nov 2026
  4. 160 due 10 Nov 2026
  5. Support ends 10 Nov 2026

Release log

Newest first. official from the project · report from news or other sites · estimate our own working.

  1. Oct 27, 2026 official Mozilla's product data lists Firefox 159.0 as the latest version, released 27 October 2026.

How to get Firefox 159

Fresh install

Most distributions include Firefox. You can also get it from mozilla.org, as a Flatpak from Flathub, or as a Snap on Ubuntu.

Upgrading

Firefox updates itself or through your distribution's updates. To check, open the menu, then Help, then About Firefox.

Organisations that want fewer changes can use Firefox ESR instead. Firefox for Linux ↗

Firefox 159 editions and flavors

FirefoxThe regular release, updated every two weeks.mozilla.org ↗Firefox ESRExtended Support Release: fewer changes, for organisations.mozilla.org ↗Beta, Developer Edition, NightlyTry the next versions early.mozilla.org ↗Firefox on FlathubInstall as a Flatpak on any distribution.flathub.org ↗

All Firefox versions

Recent Firefox releases with their support status and an official download link.

VersionReleasedGapSupportGet it
Firefox 161 24 Nov 2026 Not out yet
Firefox 160 10 Nov 2026 Not out yet
Firefox 159 Oct 27, 2026 0.5 mo Until Nov 2026 Files
Firefox 158 Oct 13, 2026 0.5 mo Ended Oct 2026 Files
Firefox 157 Sep 29, 2026 0.5 mo Ended Oct 2026 Files
Firefox 156 Sep 15, 2026 0.5 mo Ended Sep 2026 Files
Firefox 155 Sep 1, 2026 0.5 mo Ended Sep 2026 Files
Firefox 154 Aug 18, 2026 0.9 mo Ended Sep 2026 Files
Firefox 153 LTS Jul 21, 2026 1.1 mo Supported Files
Firefox 152 Jun 16, 2026 1.0 mo Ended Jul 2026 Files
Firefox 151 May 18, 2026 0.9 mo Ended Jun 2026 Files
Firefox 150 Apr 21, 2026 0.9 mo Ended May 2026 Files

Support dates from endoflife.date; gaps are computed from release dates. Links go to the project's own servers: Download = download page, Files = file archive, Notes = release notes.

Questions

When is the Firefox 159 release date?

Firefox 159 was released on Oct 27, 2026.

Where can I download Firefox 159?

From Firefox's official site, mozilla.org. We only link to official downloads and never host files ourselves.

How long is Firefox 159 supported?

Supported until November 2026. Release type: Regular release (replaced every 2 weeks).

What's new in Firefox 159?

Scroll-driven animations, Fixes for uploads and memory, Developer tools. The highlights on this page explain each one.

How often does Firefox release?

Every 2 weeks, on dates Mozilla publishes in advance. Over its recent releases the average gap was about 0.5 months.

What is Firefox ESR?

The Extended Support Release gets new features only about once a year but receives security fixes in between. Organisations use it for fewer changes; the current ESR is Firefox 153.

How often does Firefox update?

A new major version ships every two weeks, on dates Mozilla publishes in its release calendar, with smaller fix releases in between when needed.