This is a staging environment for whattrainisitnow.com

«  Firefox 160  »

42% adoption rate
Release DateNovember 10, 2026
Release OwnerDonal Meehan
Corresponding ESR releases 153.7.0 · 115.45.0?
Nightly cycle length2 weeks
Beta cycle length2 weeks
Bugs fixed in nightly 1827
Uplifts in beta88 (1 backout)
Uplifts in RC0 (0 backouts)
Uplifts in dot releases0 (0 backouts)
Total number of uplifts88
Betas5
Release Candidates1
Dot releases0
Release notes General · Developer · Enterprise
Key Milestones
Nightly start October 13
Beta start October 26
160.0 42% adoption - 100% rollout November 10
Planned 160.0.x Desktop and Android
The deadline for uplift requests is EOD on the Friday prior to go-live 		November 17
Milestones
160.0 branch is created

The firefox-v160.0 branch is created from the main branch. version.txt is bumped to 160.1 on main. Any further code change for the 160.0 release now requires an uplift request.

 October 30
160.0 release candidate is created

The 160.0 release candidate is created based on the firefox-v160.0 branch. This build might contain additional uplifts. Additionaly, the 159.3 release is tagged as shipped.

 October 30
Preliminary QA sign off on 160.0

QA gives a preliminary sign off on 160.0. 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.

 November 2
Final QA sign off on 160.0 Release notes ready

QA gives its final sign off on 160.0. 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.

 November 3
160.0 sent to Apple Store

We submit 160.0 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.

 November 3
160.1 branch is created

The firefox-v160.1 branch is created from the main branch. version.txt is bumped to 161.0 on main. Any further code change for the 160.1 release now requires an uplift request.

 November 6
160.1 release candidate is created

The 160.1 release candidate is created based on the firefox-v160.0 branch. This build might contain additional uplifts. Additionaly, the 160.0 release is tagged as shipped.

 November 6
160.0 is shipped

160.0 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%.

 November 9
Preliminary QA sign off on 160.1

QA gives a preliminary sign off on 160.1. 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.

 November 9
Final QA sign off on 160.1 Release notes ready

QA gives its final sign off on 160.1. 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.

 November 10
160.1 sent to Apple Store

We submit 160.1 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.

 November 12
160.1 is shipped

160.1 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%.

 November 16