Milestones and key data for Firefox 148

Release Date	February 24, 2026
Release Owner	Donal Meehan
Corresponding ESR releases	140.8.0 · 115.33.0^?
Nightly cycle length	5 weeks
Beta cycle length	6 weeks
Bugs fixed in nightly	1638
Uplifts in beta	257 (0 backouts)
Uplifts in RC	0 (0 backouts)
Uplifts in dot releases	0 (0 backouts)
Total number of uplifts	257
Betas	15
Release Candidates	1
Dot releases	1
Release notes	General · Developer · Enterprise

Key Milestones
Nightly start	December 9
Beta start	January 13
148.0 ^{64% adoption}	February 24
148.0.1 ^Android-only ^{100% rollout}	March 2
Planned 148.0.x ^{Desktop and Android}	March 10

Milestones
148.0 branch is created The `firefox-v148.0` branch is created from the `main` branch. `version.txt` is bumped to 148.1 on `main`. Any further code change for the 148.0 release now requires an uplift request.	February 13
148.0 release candidate is created The 148.0 release candidate is created based on the `firefox-v148.0` branch. This build might contain additional uplifts. Additionaly, the 147.3 release is tagged as shipped.	February 13
Preliminary QA sign off on 148.0 QA gives a preliminary sign off on 148.0. 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.	February 16
Final QA sign off on 148.0 Release notes ready QA gives its final sign off on 148.0. 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.	February 17
148.0 sent to Apple Store We submit 148.0 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.	February 17
148.1 branch is created The `firefox-v148.1` branch is created from the `main` branch. `version.txt` is bumped to 148.2 on `main`. Any further code change for the 148.1 release now requires an uplift request.	February 20
148.1 release candidate is created The 148.1 release candidate is created based on the `firefox-v148.0` branch. This build might contain additional uplifts. Additionaly, the 148.0 release is tagged as shipped.	February 20
148.0 is shipped 148.0 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%.	February 23
Preliminary QA sign off on 148.1 QA gives a preliminary sign off on 148.1. 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.	February 23
Final QA sign off on 148.1 Release notes ready QA gives its final sign off on 148.1. 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.	February 24
148.1 sent to Apple Store We submit 148.1 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.	February 26
148.2 branch is created The `firefox-v148.2` branch is created from the `main` branch. `version.txt` is bumped to 148.3 on `main`. Any further code change for the 148.2 release now requires an uplift request.	February 27
148.2 release candidate is created The 148.2 release candidate is created based on the `firefox-v148.0` branch. This build might contain additional uplifts. Additionaly, the 148.1 release is tagged as shipped.	February 27
148.1 is shipped 148.1 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%.	March 2
Preliminary QA sign off on 148.2 QA gives a preliminary sign off on 148.2. 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.	March 2
Final QA sign off on 148.2 Release notes ready QA gives its final sign off on 148.2. 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.	March 3
148.2 sent to Apple Store We submit 148.2 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.	March 5
148.3 branch is created The `firefox-v148.3` branch is created from the `main` branch. `version.txt` is bumped to 149.0 on `main`. Any further code change for the 148.3 release now requires an uplift request.	March 5
148.3 release candidate is created The 148.3 release candidate is created based on the `firefox-v148.0` branch. This build might contain additional uplifts. Additionaly, the 148.2 release is tagged as shipped.	March 5
148.2 is shipped 148.2 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%.	March 9
Preliminary QA sign off on 148.3 QA gives a preliminary sign off on 148.3. 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.	March 9
Final QA sign off on 148.3 Release notes ready QA gives its final sign off on 148.3. 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.	March 10
148.3 sent to Apple Store We submit 148.3 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.	March 12
148.3 is shipped 148.3 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%.	March 16