Mozilla Firefox Release Schedule

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The Firefox Release Schedule overview offers information about past, present and future releases of the Mozilla Firefox web browser.

With four different versions of the Firefox web browser available at any time, plus special builds that pop up every now and then and ESR versions, it is quite difficult to keep up with the browser’s rapid release schedule.

To make matters even more complicated, some versions like the aurora or nightly versions get updated fairly often. To bring order into chaos, release schedules usually only concentrate on version increases and not all the updates that get released.

Mozilla’s official Release Schedule page lists only the next version upgrade for Firefox stable, beta, aurora and nightly, but does not go beyond that.

While you can try to calculate the releases after the next by adding 42 days to a fixed release date, actual release dates may fluctuate especially for the beta and aurora version increases.

Update: Mozilla announced the move to a variable Firefox release schedule recently.

Firefox Release Schedule

mozilla firefox release schedule

Sören Hentzschel today released his own Firefox and Thunderbird release calendar which includes not only both the Mozilla Firefox web browser and Mozilla Thunderbird email client, but also Beta, Aurora and ESR versions of Firefox.  The table currently covers all upcoming releases for the year, and even provides an outlook of the first releases of next year.

Mozilla Firefox Release Schedule

Our Firefox release schedule lists all Firefox versions, meaning Firefox Stable, Beta, Developer Edition (Aurora), Nightly, and ESR, the version they are updated to, and the date this is going to happen.

It won’t reference minor version updates as those are not scheduled usually but pushed out when it is required.

  • Firefox 48, Beta 49, Aurora 50, Nightly 51, Firefox 45.3 ESR – 2.8.2016
  • Firefox 49, Beta 50, Aurora 51, Nightly 52, Firefox 45.4 ESR – 20.9.2016
  • Firefox 50, Beta 51, Aurora 52, Nightly 53, Firefox 45.5 ESR – 15.11.2016
  • Firefox 50.0.1, Firefox ESR 45.5.1  – 13.12.2016
  • Firefox 51, Beta 52, Aurora 53, Nightly 54, Firefox 45.6 ESR – 24.1.2017
  • Firefox 52, Beta 53, Aurora 54, Nightly 55, Firefox 45.7 ESR (start of Firefox 52.0 ESR) – 7.3.2017
  • Firefox 53, Beta 54, Aurora 55, Nightly 56, Firefox 45.8 ESR (Firefox 52.1 ESR) – 18.4.2017
  • Firefox 54, Beta 55, Aurora 56, Nightly 57, Firefox ESR 52.2  – 13.6.2017
  • Firefox 55, Beta 56, Aurora 57, Nightly 58, Firefox ESR 52.3 – 8.8.2017
  • Firefox 56, Beta 57, Aurora 58, Nightly 59, Firefox ESR 52.4 – 3.10.2017
  • Firefox 57, Beta 58, Aurora 59, Nightly 60, Firefox ESR 52.5 – 28.11.2017
  • Firefox 58, Beta 59, Aurora 60, Nightly 61, Firefox ESR 52.6 – 22.1.2018

Past Firefox Releases

This is the list of past releases for Firefox. While it is not recommended to run any of those versions anymore, it may be used for reference.

  • Firefox 15, Beta 16, Aurora 17 – 28.8.2012
  • Firefox 16, Beta 17, Aurora 18 – 9.10.2012
  • Firefox 17, Beta 18, Aurora 19 – 20.11.2012
  • Firefox 18, Beta 19, Aurora 20 – 8.1.2013
  • Firefox 19, Beta 20, Aurora 21 – 19.2.2013
  • Firefox 20, Beta 21, Aurora 22 – 2.4.2013
  • Firefox 21, Beta 22, Aurora 23 – 14.5.2013
  • Firefox 22, Beta 23, Aurora 24 – 25.6.2013
  • Firefox 23, Beta 24, Aurora 25 – 27.6.2013
  • Firefox 24, Beta 25, Aurora 26, Firefox 24.0 ESR – 17.9.2013
  • Firefox 25, Beta 26, Aurora 27, Firefox 24.1 ESR – 29.10.2013
  • Firefox 26, Beta 27, Aurora 28, Firefox 24.2 ESR – 10.12.2013
  • Firefox 27, Beta 28, Aurora 29, Firefox 24.3 ESR – 21.1.2014
  • Firefox 28, Beta 29, Aurora 30, Nightly 31, Firefox 24.4 ESR – 4.3.2014
  • Firefox 29, Beta 30, Aurora 31, Nightly 32, Firefox 24.5 ESR – 29.4.2014
  • Firefox 30, Beta 31, Aurora 32, Nightly 33, Firefox 24.6 ESR – 10.6.2014
  • Firefox 31, Beta 32, Aurora 33, Nightly 34Firefox 31.0 ESR – 22.7.2014
  • Firefox 32, Beta 33, Aurora 34, Nightly 35, Firefox 31.1 ESR -2.9.2014
  • Firefox 33, Beta 34, Aurora 35, Nightly 36, Firefox 31.2 ESR – 14.10.2014
  • Firefox 34, Beta 35,  Aurora 36, Nightly 37, Firefox 31.3 ESR – 25.11.2014
  • Firefox 35, Beta 36, Aurora 37, Nightly 38, Firefox 31.4 ESR – 13.1.2015
  • Firefox 36, Beta 37, Aurora 38, Nightly 39, Firefox 31.5 ESR – 24.02.2015
  • Firefox 37, Beta 38, Aurora 39, Nightly 40, Firefox 31.6 ESR – 7.4.2015
  • Firefox 38, Beta 39, Aurora 40, Nightly 41, Firefox 38.0 ESR – 19.5.2015
  • Firefox 39, Beta 40, Aurora 41, Nightly 42, Firefox 38.1 ESR – 30.6.2015
  • Firefox 40, Beta 41, Aurora 42, Nightly 43, Firefox 38.2 ESR – 11.8.2015
  • Firefox 41, Beta 42, Aurora 43, Nightly 44, Firefox 38.3 ESR – 22.9.2015
  • Firefox 42, Beta 43, Aurora 44, Nightly 45, Firefox 38.4 ESR – 3.11.2015
  • Firefox 43, Beta 44, Aurora 45, Nightly 46, Firefox 38.5 ESR – 15.12.2015
  • Firefox 44, Beta 45, Aurora 46, Nightly 47, Firefox 38.6 ESR – 26.1.2016
  • Firefox 45, Beta 46, Aurora 47, Nightly 48, Firefox 45.0 ESR – 8.3.2016
  • Firefox 46, Beta 47, Aurora 48, Nightly 49, Firefox 45.1 ESR – 26.4.2016
  • Firefox 47, Beta 48, Aurora 49, Nightly 50, Firefox 45.2 ESR – 7.6.2016

The release schedule for Firefox and Thunderbird is regularly updated by us so that you will always know when future versions and editions of Firefox are released by Mozilla.

Since Mozilla moved from a 42 release cycle to a flexible scheme, it becomes even more important to keep an eye on these releases.