Milestones and key data for Firefox 150

Release Date	April 21, 2026
Release Owner	Dianna Smith
Corresponding ESR releases	140.10.0
Nightly cycle length	4 weeks
Beta cycle length	4 weeks
Bugs fixed in nightly	2254
Uplifts in beta	532 (0 backouts)
Uplifts in RC	0 (0 backouts)
Uplifts in dot releases	0 (0 backouts)
Total number of uplifts	532
Betas	10
Release Candidates	1
Dot releases	0
Release notes	General · Developer · Enterprise

Key Milestones
Nightly start	February 24
Beta start	March 25
150.0 ^{0% adoption - 25% rollout}	April 21
Potential Android 150.0.x	April 28
Planned 150.0.x ^{Desktop and Android}	May 5

Milestones
150.0 branch is created The `firefox-v150.0` branch is created from the `main` branch. `version.txt` is bumped to 150.1 on `main`. Any further code change for the 150.0 release now requires an uplift request.	April 10
150.0 release candidate is created The 150.0 release candidate is created based on the `firefox-v150.0` branch. This build might contain additional uplifts. Additionaly, the 149.3 release is tagged as shipped.	April 10
Preliminary QA sign off on 150.0 QA gives a preliminary sign off on 150.0. 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.	April 13
Final QA sign off on 150.0 Release notes ready QA gives its final sign off on 150.0. 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.	April 14
150.0 sent to Apple Store We submit 150.0 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.	April 14
150.1 branch is created The `firefox-v150.1` branch is created from the `main` branch. `version.txt` is bumped to 150.2 on `main`. Any further code change for the 150.1 release now requires an uplift request.	April 17
150.1 release candidate is created The 150.1 release candidate is created based on the `firefox-v150.0` branch. This build might contain additional uplifts. Additionaly, the 150.0 release is tagged as shipped.	April 17
150.0 is shipped 150.0 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%.	April 20
Preliminary QA sign off on 150.1 QA gives a preliminary sign off on 150.1. 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.	April 20
Final QA sign off on 150.1 Release notes ready QA gives its final sign off on 150.1. 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.	April 21
150.1 sent to Apple Store We submit 150.1 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.	April 23
150.2 branch is created The `firefox-v150.2` branch is created from the `main` branch. `version.txt` is bumped to 150.3 on `main`. Any further code change for the 150.2 release now requires an uplift request.	April 24
150.2 release candidate is created The 150.2 release candidate is created based on the `firefox-v150.0` branch. This build might contain additional uplifts. Additionaly, the 150.1 release is tagged as shipped.	April 24
150.1 is shipped 150.1 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%.	April 27
Preliminary QA sign off on 150.2 QA gives a preliminary sign off on 150.2. 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.	April 27
Final QA sign off on 150.2 Release notes ready QA gives its final sign off on 150.2. 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.	April 28
150.2 sent to Apple Store We submit 150.2 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.	April 30
150.3 branch is created The `firefox-v150.3` branch is created from the `main` branch. `version.txt` is bumped to 151.0 on `main`. Any further code change for the 150.3 release now requires an uplift request.	May 1
150.3 release candidate is created The 150.3 release candidate is created based on the `firefox-v150.0` branch. This build might contain additional uplifts. Additionaly, the 150.2 release is tagged as shipped.	May 1
150.2 is shipped 150.2 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%.	May 4
Preliminary QA sign off on 150.3 QA gives a preliminary sign off on 150.3. 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.	May 4
Final QA sign off on 150.3 Release notes ready QA gives its final sign off on 150.3. 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.	May 5
150.3 sent to Apple Store We submit 150.3 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.	May 7
150.3 is shipped 150.3 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%.	May 11