Mozilla Firefox

October 2026

• Wed 7 Oct Install and upgrade New version · Mozilla Firefox · Beta: 158.0b5
• Tue 6 Oct Install and upgrade New version · Mozilla Firefox · Release: 157.0.1

September 2026

• Tue 29 Sep Install and upgrade New version · Mozilla Firefox · ESR 115: 115.42.0
• Tue 29 Sep Install and upgrade New version · Mozilla Firefox · ESR 140: 140.17.0
• Tue 29 Sep Install and upgrade New version · Mozilla Firefox · ESR 153: 153.4.0
• Tue 29 Sep Install and upgrade New version · Mozilla Firefox · Release: 157.0
• Tue 15 Sep Install and upgrade New version · Mozilla Firefox · ESR 115: 115.41.0
• Tue 15 Sep Install and upgrade New version · Mozilla Firefox · ESR 140: 140.16.0
• Tue 15 Sep Install and upgrade New version · Mozilla Firefox · ESR 153: 153.3.0
• Tue 1 Sep Install and upgrade New version · Mozilla Firefox · ESR 115: 115.40.0
• Tue 1 Sep Install and upgrade New version · Mozilla Firefox · ESR 140: 140.15.0
• Tue 1 Sep Install and upgrade New version · Mozilla Firefox · ESR 153: 153.2.0

August 2026

• Tue 18 Aug Install and upgrade New version · Mozilla Firefox · ESR 115: 115.39.0
• Tue 18 Aug Install and upgrade New version · Mozilla Firefox · ESR 140: 140.14.0
• Tue 18 Aug Install and upgrade New version · Mozilla Firefox · ESR 153: 153.1.0
• Tue 11 Aug Install and upgrade New version · Mozilla Firefox · ESR 153: 153.0.4
• Tue 4 Aug Install and upgrade New version · Mozilla Firefox · ESR 153: 153.0.3

July 2026

• Tue 28 Jul Install and upgrade New version · Mozilla Firefox · ESR 153: 153.0.1
• Tue 21 Jul Install and upgrade New version · Mozilla Firefox · ESR 115: 115.38.0
• Tue 21 Jul Install and upgrade New version · Mozilla Firefox · ESR 140: 140.13.0
• Tue 21 Jul Install and upgrade New version · Mozilla Firefox · ESR 153: 153.0

June 2026

• Tue 16 Jun Install and upgrade New version · Mozilla Firefox · ESR 115: 115.37.0
• Tue 16 Jun Install and upgrade New version · Mozilla Firefox · ESR 140: 140.12.0

May 2026

• Tue 19 May Install and upgrade New version · Mozilla Firefox · ESR 115: 115.36.0
• Tue 19 May Install and upgrade New version · Mozilla Firefox · ESR 140: 140.11.0
• Thu 7 May Install and upgrade New version · Mozilla Firefox · ESR 115: 115.35.2
• Thu 7 May Install and upgrade New version · Mozilla Firefox · ESR 140: 140.10.2

Sorted from how each source classifies its records: what's-new pages, releases, documentation changes, notices, roadmap items, and network changes. A kind is a reading aid, not Microsoft's own category.