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Firefox Switches to Two-Week Release Cycle Starting September 2026
Дата публикации: 14-07-2026 07:50:14
Mozilla plans to shift Firefox to a two-week release cycle starting in September 2026, according to Mozilla Director Sylvestre Ledru.
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Mozilla plans to shift Firefox to a two-week release cycle starting in September 2026, according to Mozilla Director Sylvestre Ledru. The company describes this faster update schedule as an experiment and emphasizes that it may alter course if unexpected issues arise.
Firefox 154, set for release on August 18, will be the last version issued on the current monthly schedule. Instead of two weeks later, Firefox 155 is scheduled to arrive on September 1.
The Firefox Release Calendar has been updated to reflect the new schedule. This change affects Firefox users on both desktop and Android platforms.
What Changes With Firefox’s New Two-Week Release Cycle and WhyUnder the new schedule:
- Firefox 154 will be released on August 18, 2026, marking the final monthly update.
- Firefox 155 is scheduled for September 1, 2026, as the first of the new biweekly releases. After that, updates will continue every two weeks.
The revised Firefox Release Calendar shows the new release pattern for all upcoming versions. Mozilla will keep an eye on the transition and make adjustments if any issues arise.
Mozilla mentioned that the faster release schedule will let developers deliver more updates to the browser more often. Ledru also said the release process should become more predictable, with fewer hurdles impacting rollout plans.
Developers aren't being asked to work twice as fast. Features that aren’t ready yet will still get extra attention rather than being pushed out prematurely. The two-week cycle impacts how often stable versions are released, not how fast individual features go through development.
How the New Cadence Aligns With Chrome and Edge and Early User ReactionFirefox's move brings it in line with the release cadence used by Google Chrome and Microsoft Edge. Google Chrome announced a two-week release cycle in March 2026, while Microsoft Edge announced a similar schedule with Edge 152, set for August 27, 2026. Firefox will adopt a two-week cadence starting in September 2026.
Chrome's shift was framed as a way to improve security, reliability, and performance across the web platform. Edge's transition was a straightforward decision, as it is built on Chromium.
Mozilla's change is more notable because Firefox relies on the independent Gecko layout engine. Firefox has traditionally maintained a slower release schedule compared to Chromium-based browsers, partly because developing Gecko requires a separate release infrastructure.
Initial reactions from users on Reddit and other forums have been mixed. Common concerns include Mozilla following Google's design choices even when those decisions are unpopular, fears that the browser may experience more frequent issues under the faster release cycle, and doubts about whether Mozilla's development resources can support twice as many stable releases. Some Firefox users have also criticized Mozilla's adoption of Chrome-influenced design decisions, such as the WebExtensions model for browser add-ons.
What the Faster Cadence Means for Users, ESR, and Extension DevelopersFor most Firefox users, the two-week release cycle will feel seamless. Automatic updates will keep installing new versions in the background without disruption.
Users who prefer to control when updates happen can change their update preferences through Firefox Settings under General, then Firefox Updates. They can choose to check for updates but decide manually when to install them.
Users who are in enterprise environments can opt for the Firefox Extended Support Release, which continues to receive security updates on a slower schedule, offering increased stability.
For organizations, the ESR channel remains a good option for those needing consistent stability. ESR versions focus on security updates and avoid frequent new features, which helps when testing new releases before deployment in regulated environments.
Extension developers targeting Firefox may need to adjust their testing and release schedules to keep pace with the faster update cycle. The two-week release window increases the frequency of API changes, deprecations, and behavioral updates that can impact extensions.
Developers should monitor Firefox's release notes for API changes that could affect their extensions, boost automated testing to catch issues earlier, and consider using the Nightly and Beta channels for early warning of potential problems.
AvailabilityThe two-week release schedule kicks off with Firefox 155 on September 1, 2026. Meanwhile, Firefox 154 will continue on the current monthly cycle, with a release planned for August 18, 2026.
Mozilla has not committed to maintaining the faster pace indefinitely. The company considers this an experiment and will assess its impact on release quality, developer workload, and user experience before deciding whether to make it a permanent change.
Users can stay informed by watching Mozilla's official announcements and the Firefox Release Calendar for updates on the schedule and any adjustments during the transition.
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