Firefox Shortens Release Cycle from 4 Weeks to 2 Weeks

Mozilla's Firefox browser is reducing the interval between new version releases. Extended Support Release (ESR) versions will remain on an annual schedule. According to The Register, Mozilla Engineering Director Sylvester Lerdrue announced plans to cut the desktop and Android release cycle from 4 weeks to 2 weeks starting September 2026. He clarified this is an experiment, not a doubling of release speed, emphasizing that rushed unprepared work is unnecessary and time should be invested in required features. Lerdrue stated the current goal is to release Firefox 155 on September 1 instead of September 15, adding that adjustments may be made based on actual implementation results. This change has already been reflected in the Firefox release calendar, with Firefox 153 and 154 maintaining the 4-week cycle but Firefox 155 and subsequent versions following a 2-week interval starting September 1. Mozilla's initiative marks a decade-long effort, similar to Google's recent change to Chrome's release schedule. Firefox 153, set for release on September 21, includes features like merging multiple PDFs via drag-and-drop, inserting images into PDFs as new pages, and improved text highlighting.