Mozilla is changing how often it ships Firefox. Starting in September 2026, the browser will move from a four-week release cycle to a two-week (bi-weekly) release cadence, matching the faster schedules that Google Chrome and Microsoft Edge already adopted this year. The switch begins with Firefox 155, which is now targeted for September 1, 2026 instead of mid-September.
The plan was shared by Sylvestre Ledru, a director at Mozilla, on the Firefox development mailing list, and it covers both Firefox Desktop and Firefox for Android. Mozilla is treating the change as an experiment for now.
Key Takeaways
- Firefox moves from a four-week to a two-week release cycle in September 2026.
- The change starts with Firefox 155 on September 1, 2026.
- It applies to Firefox Desktop and Firefox for Android, and Mozilla calls it an experiment it may adjust.
- Chrome switched to a two-week cadence in March 2026, and Edge soon followed.
- In the Philippines, Firefox holds only about 0.91% of browser use (June 2026).
What Mozilla is changing
Today, a new main version of Firefox lands roughly once a month. Under the new plan, users will get two updates per month. The key details:
- Current cycle: four weeks between major releases
- New cycle: two weeks between major releases
- Last monthly release: Firefox 154, expected around August 18, 2026
- First bi-weekly release: Firefox 155 on September 1, 2026
- Scope: Firefox Desktop and Firefox for Android
The faster pace means version numbers will climb more quickly through the rest of the year, since each release still gets a new number. The move mirrors what rival browsers have already done, TechSpot reported.
Why Mozilla wants faster releases
Mozilla says the goal is to get finished work to users sooner and to make the whole process smoother. In his message, Ledru said the change aims to "give work that is ready to ship more frequent opportunities to reach users, while making the release process more predictable and reducing pressure on uplifts."
An "uplift" is when engineers move a code change out of an early test build and into a more stable version ahead of schedule. With releases only four weeks apart, teams often push to squeeze a fix into the next version before the window closes. Shorter gaps mean the next release is never far away, so there is less pressure to rush a change into the current one.
Speed does not mean rushing features
Mozilla was careful to say the faster schedule is not a demand to build everything twice as fast. "This does not mean that all work needs to ship twice as fast," Ledru wrote. "Work that is not ready should not be rushed, and features can still take the time they need to bake."
Because it is labeled an experiment, Mozilla plans to watch how the change performs in practice and adjust if problems appear. Some users online have already raised concerns that more frequent updates could bring more instability, so the company is leaving room to pull back.
How it compares to Chrome and Edge
Firefox is the last of the big browsers to make this move. Google Chrome switched to a two-week release cadence in March 2026, and Microsoft Edge, which is built on the same Chromium base as Chrome, soon matched it.
The shift is a bigger lift for Firefox. It runs on Gecko, Mozilla's own engine (the software that reads a website's code and draws the page on your screen), rather than Chromium. That means Mozilla cannot simply copy the schedule work that Chrome and Edge share, and has to make its own release process handle the tighter timeline.
What it means for Filipino users
Firefox is a small player in the Philippines. Statcounter data for June 2026 puts Firefox at just 0.91% of browser use in the country, far behind Chrome at 85.88%, Safari at 5.43%, and Edge at 4.83%.
For the Filipinos who do use Firefox, the change happens quietly. The browser updates itself in the background, so there is nothing to install by hand and no action needed. The main upside is that security patches and new features should arrive sooner. The trade-off, as some users have noted, is simply seeing update prompts more often. Firefox is free, so there is no pricing or subscription tied to the change.
FAQ
When does the new Firefox schedule start?
Firefox 155, due September 1, 2026, is the first release on the two-week cycle. Firefox 154, expected around August 18, is the last release on the old monthly schedule.
Do I need to do anything?
No. Firefox updates automatically for most users, so you will simply receive new versions more often than before.
Is the two-week cycle permanent?
Not yet. Mozilla is calling it an experiment and has said it will monitor the results and change course if needed.
