«  Firefox 154  »

Adoption rate unavailable
Release DateAugust 18, 2026
Release OwnerDianna Smith
Corresponding ESR releases 153.1.0 · 140.14.0 · 115.39.0?
Nightly cycle length5 weeks
Beta cycle length4 weeks
Bugs fixed in nightly 2871
Uplifts in beta333 (0 backouts)
Uplifts in RC0 (0 backouts)
Uplifts in dot releases32 (0 backouts)
Total number of uplifts365
Betas10
Release Candidates1
Dot releases1
Release notes General · Developer · Enterprise
Key Milestones
Nightly start June 16
Beta start July 22
154.0 (adoption rate unavailable) August 18
154.0.1 100% rollout August 25
Milestones
154.0 branch is created

The firefox-v154.0 branch is created from the main branch. version.txt is bumped to 154.1 on main. Any further code change for the 154.0 release now requires an uplift request.

 August 7
154.0 release candidate is created

The 154.0 release candidate is created based on the firefox-v154.0 branch. This build might contain additional uplifts. Additionaly, the 153.3 release is tagged as shipped.

 August 7
Preliminary QA sign off on 154.0

QA gives a preliminary sign off on 154.0. If it is green, we push the build to the External Beta Testers group. Otherwise, the dev team fixes the issues reported by QA, uplift them to the release branch and we build another Release Candidate.

 August 10
Final QA sign off on 154.0 Release notes ready

QA gives its final sign off on 154.0. If the sign off is red, the dev team fixes the issues reported by QA, uplift them to the release branch and we build another Release Candidate.

 August 11
154.0 sent to Apple Store

We submit 154.0 for review to the Apple Store. If we don`t have a working build by the end of the day, we may not ship this week.

 August 11
154.1 branch is created

The firefox-v154.1 branch is created from the main branch. version.txt is bumped to 154.2 on main. Any further code change for the 154.1 release now requires an uplift request.

 August 14
154.1 release candidate is created

The 154.1 release candidate is created based on the firefox-v154.0 branch. This build might contain additional uplifts. Additionaly, the 154.0 release is tagged as shipped.

 August 14
154.0 is shipped

154.0 is shipped on the Apple Store at 3:00 AM UTC with a phased 7 days rollout:
Monday: 1%, Tuesday: 2%, Wednesday: 5%, Thursday: 10%, Friday: 20%, Saturday: 50%, Sunday: 100%.

 August 17
Preliminary QA sign off on 154.1

QA gives a preliminary sign off on 154.1. If it is green, we push the build to the External Beta Testers group. Otherwise, the dev team fixes the issues reported by QA, uplift them to the release branch and we build another Release Candidate.

 August 17
Final QA sign off on 154.1 Release notes ready

QA gives its final sign off on 154.1. If the sign off is red, the dev team fixes the issues reported by QA, uplift them to the release branch and we build another Release Candidate.

 August 18
154.1 sent to Apple Store

We submit 154.1 for review to the Apple Store. If we don`t have a working build by the end of the day, we may not ship this week.

 August 20
154.1 is shipped

154.1 is shipped on the Apple Store at 3:00 AM UTC with a phased 7 days rollout:
Monday: 1%, Tuesday: 2%, Wednesday: 5%, Thursday: 10%, Friday: 20%, Saturday: 50%, Sunday: 100%.

 August 24