Milestones and key data for Firefox 152

Release Date	June 16, 2026
Release Owner	Ryan VanderMeulen
Corresponding ESR releases	140.12.0 · 115.37.0^?
Nightly cycle length	4 weeks
Beta cycle length	4 weeks
Bugs fixed in nightly	2646
Uplifts in beta	382 (0 backouts)
Uplifts in RC	0 (0 backouts)
Uplifts in dot releases	0 (0 backouts)
Total number of uplifts	382
Betas	10
Release Candidates	1
Dot releases	0
Release notes	General · Developer · Enterprise

Key Milestones
Nightly start	April 21
Beta start	May 20
152.0 ^{0% adoption - 25% rollout}	June 16
Planned 152.0.x ^{Desktop and Android}	June 23
Planned 152.0.x ^{Desktop and Android}	June 30
Planned 152.0.x ^{Desktop and Android}	July 7
Planned 152.0.x ^{Desktop and Android}	July 14

Milestones
152.0 branch is created The `firefox-v152.0` branch is created from the `main` branch. `version.txt` is bumped to 152.1 on `main`. Any further code change for the 152.0 release now requires an uplift request.	June 4
152.0 release candidate is created The 152.0 release candidate is created based on the `firefox-v152.0` branch. This build might contain additional uplifts. Additionaly, the 151.3 release is tagged as shipped.	June 4
Preliminary QA sign off on 152.0 QA gives a preliminary sign off on 152.0. 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.	June 8
Final QA sign off on 152.0 Release notes ready QA gives its final sign off on 152.0. 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.	June 9
152.0 sent to Apple Store We submit 152.0 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.	June 9
152.1 branch is created The `firefox-v152.1` branch is created from the `main` branch. `version.txt` is bumped to 152.2 on `main`. Any further code change for the 152.1 release now requires an uplift request.	June 12
152.1 release candidate is created The 152.1 release candidate is created based on the `firefox-v152.0` branch. This build might contain additional uplifts. Additionaly, the 152.0 release is tagged as shipped.	June 12
152.0 is shipped 152.0 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%.	June 15
Preliminary QA sign off on 152.1 QA gives a preliminary sign off on 152.1. 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.	June 15
Final QA sign off on 152.1 Release notes ready QA gives its final sign off on 152.1. 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.	June 16
152.1 sent to Apple Store We submit 152.1 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.	June 18
152.2 branch is created The `firefox-v152.2` branch is created from the `main` branch. `version.txt` is bumped to 152.3 on `main`. Any further code change for the 152.2 release now requires an uplift request.	June 19
152.2 release candidate is created The 152.2 release candidate is created based on the `firefox-v152.0` branch. This build might contain additional uplifts. Additionaly, the 152.1 release is tagged as shipped.	June 19
152.1 is shipped 152.1 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%.	June 22
Preliminary QA sign off on 152.2 QA gives a preliminary sign off on 152.2. 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.	June 22
Final QA sign off on 152.2 Release notes ready QA gives its final sign off on 152.2. 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.	June 23
152.2 sent to Apple Store We submit 152.2 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.	June 25
152.3 branch is created The `firefox-v152.3` branch is created from the `main` branch. `version.txt` is bumped to 152.4 on `main`. Any further code change for the 152.3 release now requires an uplift request.	June 26
152.3 release candidate is created The 152.3 release candidate is created based on the `firefox-v152.0` branch. This build might contain additional uplifts. Additionaly, the 152.2 release is tagged as shipped.	June 26
152.2 is shipped 152.2 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%.	June 29
Preliminary QA sign off on 152.3 QA gives a preliminary sign off on 152.3. 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.	June 29
Final QA sign off on 152.3 Release notes ready QA gives its final sign off on 152.3. 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.	June 30
152.3 sent to Apple Store We submit 152.3 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.	July 2
152.4 branch is created The `firefox-v152.3` branch is created from the `main` branch. `version.txt` is bumped to 153.0 on `main`. Any further code change for the 152.3 release now requires an uplift request.	July 3
152.4 release candidate is created The 152.4 release candidate is created based on the `firefox-v152.0` branch. This build might contain additional uplifts. Additionaly, the 152.3 release is tagged as shipped.	July 3
152.3 is shipped 152.3 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%.	July 6
Preliminary QA sign off on 152.4 QA gives a preliminary sign off on 152.4. 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.	July 6
Final QA sign off on 152.4 Release notes ready QA gives its final sign off on 152.4. 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.	July 7
152.4 sent to Apple Store We submit 152.4 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.	July 9
152.4 is shipped 152.4 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%.	July 13