Mozilla plans to shift Firefox to a two-week release cycle starting in September 2026, according to Mozilla head Sylvestre Ledru. The company describes this faster update program as an experiment and emphasizes that it may change course if unexpected problems arise.
Firefox 154, scheduled for release on August 18, will be the last version released according to the current monthly schedule. Instead of two weeks later, Firefox 155 is scheduled to arrive on September 1.
The Firefox release schedule 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 why
According to the new schedule:
- Firefox 154 will be released on August 18, 2026, which will mark the last monthly update.
- Firefox 155 is scheduled for September 1, 2026, as the first of new biweekly releases. After that, updates will continue every two weeks.
The revised Firefox Release Schedule shows the new release pattern for all upcoming versions. Mozilla will monitor the transition and make adjustments if any problems arise.
Mozilla mentioned that a faster release schedule will allow developers to deliver more updates to the browser more frequently. Ledru also said the launch process should be more predictable, with fewer obstacles affecting deployment plans.
Developers are not asked to work twice as fast. Features that are not ready yet will receive additional attention instead of being removed prematurely. The two-week cycle affects how often stable versions are released, not how quickly individual features are developed.
How the new cadence aligns with Chrome and Edge and early user reaction
Firefox’s move aligns it with the launch 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.
The Chrome change was proposed as a way to improve security, reliability, and performance across the web platform. Transitioning from Edge was an easy decision since it is based on Chromium.
Mozilla’s change is more notable because Firefox is based on the independent Gecko layout engine. Firefox has traditionally maintained a slower release schedule compared to Chromium-based browsers, in part because Gecko development 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 questions 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 Faster Cadence Means for Users, ESRs, and Extension Developers
For most Firefox users, the two-week release cycle will be perfect. Automatic updates will continue installing new versions in the background without interruption.
Users who prefer to control when updates occur can change their update preferences through Firefox Settings under General and then Firefox Updates. They can choose to check for updates but manually decide when to install them.
Users in enterprise environments can opt for the extended support version of Firefox, which continues to receive security updates on a slower schedule, offering greater stability.
For organizations, the ESR channel remains a good option for those who need constant stability. ESR releases focus on security updates and avoid frequent new features, which helps when testing new releases before deploying them to regulated environments.
Developers of extensions 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 detect issues earlier, and consider using the Nightly and Beta channels to receive early alerts about potential issues.
Availability
The two-week release schedule begins with Firefox 155 on September 1, 2026. Meanwhile, Firefox 154 will continue the current monthly cycle, with a planned release for August 18, 2026.
Mozilla has not committed to maintaining the faster pace indefinitely. The company considers this an experiment and will evaluate its impact on release quality, developer workload, and user experience before deciding whether to make a permanent change.
Users can stay informed by viewing official Mozilla announcements and the Firefox Release Calendar for updates on the schedule and any adjustments during the transition.
