Mozilla speeds Firefox release schedule to biweekly
And what to expect in Firefox 153 as the next ESR release gets close
Firefox releases will soon get even closer together – but not ESR ones, which remain annual, with the next one due out soon. The change was announced last week on the dev-platform@mozilla.org mailing list by Mozilla’s director of engineering Sylvestre Ledru:
“We are planning to move Firefox Desktop and Android from a 4-week release cadence to a 2-week release cadence starting in September 2026.
“This will be an experiment… This does not mean that all work needs to ship twice as fast. Work that is not ready should not be rushed, and features can still take the time they need to bake.
“The current target is to release Firefox 155 on September 1, 2026, instead of September 15 …
“We will closely monitor how this change works in practice and adjust if needed.”
The change...
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