Name: Mozilla Firefox (son)
Author: Mozilla

Mozilla Firefox (son)

Mozilla·Mozilla.Firefox.son

Mozilla Firefox is free and open source software, built by a community of thousands from all over the world.

Firefox Browser, also known as Mozilla Firefox or simply Firefox, is a free and open-source web browser developed by the Mozilla Foundation and its subsidiary, the Mozilla Corporation. Firefox uses the Gecko layout engine to render web pages, which implements current and anticipated web standards. In 2017, Firefox began incorporating new technology under the code name Quantum to promote parallelism and a more intuitive user interface. Firefox is officially available for Windows 7 or newer, macOS, and Linux. Its unofficial ports are available for various Unix and Unix-like operating systems including FreeBSD, OpenBSD, NetBSD, illumos, and Solaris Unix.

winget install --id Mozilla.Firefox.son --exact --source winget

Latest 156.0·September 15, 2026

Release Notes

Version 156.0, first offered to Release channel users on September 15, 2026

New

Firefox on macOS can now be set to open automatically when the computer starts up, from the Startup section of Settings.
Localized Wikipedia and occasional sponsored suggestions in the address bar are now available in France, Germany, and Italy. These suggestions can be turned off in Firefox Suggest settings.

Fixed

Fixed an issue where dragging an image to a new position in a rich-text editor could replace it with a long line of text instead of moving it.
Fixed high-sample-rate FLAC audio in MP4 failing to play on sites such as Bilibili.
Fixed subtitles not appearing in the Picture-in-Picture window when they are turned on in the video player after the window has already opened.
Fixed bookmarks moving out of their folder when the folder and the bookmarks inside it were selected and dragged together in the Bookmarks sidebar.
Fixed the find bar becoming permanently unavailable in a tab after reversing the panes in Split View.
Fixed some sites failing to load when DNS over HTTPS is enabled and the site does not support HTTPS.
Fixed Firefox losing all network connectivity for some users with the built-in VPN enabled.
Fixed an issue on Windows where Firefox could block an auto-hiding taskbar from showing.
Various security fixes.

Changed

Firefox's built-in PDF viewer now starts up to 45% faster.
Improved memory and CPU usage when Firefox displays large JPEG images scaled down to fit a page.
On Windows devices with ARM64 processors, WebRTC video calls may now use hardware H264 decoding instead of falling back to software.

Enterprise

You can find information about policy updates and enterprise-specific bug fixes in the Firefox for Enterprise 156 Release Notes.

Developer

Web Platform

text-box-trim now uses the font metrics of a ::first-line pseudo-element when one applies, matching other browsers and the specification.

Community Contributions

With the release of Firefox 156, we are pleased to welcome the developers who contributed their first code change to Firefox in this release, 10 of whom were brand new volunteers! Please join us in thanking each of these diligent and enthusiastic individuals, and take a look at their contributions:
- Aaron Ma: 2063818
- Dominik Bay [:eimann]: 2066736
- ExplodingJoysticks: 1728637, 1890400, 1910664, 1928343, 1944206, 2000658, 2003000, 2059911, 2061541
- Gopalarathnam Venkatesan: 2003172, 2042426, 2062096, 2062952, 2062989
- Hugo Osvaldo Barrera: 2063808
- Kana: 2062133
- Kerissa Grubb: 2042422
- Louis-Philippe Manette: 2062972, 2063867
- Seunghyun An: 2063033
- William McDonald: 1034964

Installer type: `nullsoft`

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Details

Homepage: https://www.mozilla.org/firefox/
License: MPL-2.0
Publisher: Mozilla
Support: https://support.mozilla.org/
Privacy Policy: https://www.mozilla.org/privacy/firefox/
Copyright: © Firefox and Mozilla Developers; available under the MPL 2 license.
Moniker: firefox

Older versions (57)

155.0.1

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155.0

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154.0.1

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154.0

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153.0.4

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153.0.3

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153.0.1

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153.0

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152.0.6

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152.0.5

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152.0.4

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152.0.3

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152.0.2

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152.0.1

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152.0

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151.0.4

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151.0.3

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151.0.2

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151.0.1

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151.0

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150.0.3

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150.0.2

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150.0.1

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149.0.2

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149.0

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148.0.2

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148.0

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147.0.4

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147.0.3

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147.0.2

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147.0.1

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147.0

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146.0.1

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146.0

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145.0.2

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145.0.1

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145.0

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144.0.2

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144.0

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143.0.4

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143.0.3

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143.0.1

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143.0

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142.0.1

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142.0

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141.0.3

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141.0.2

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141.0

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140.0.4

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140.0.2

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140.0.1

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140.0

x86—A2AD9DFE152426534BA0A08DD475329B0C1058D9ABD51FD6D02810B81DB995F4

x64—E2552DD65BDEB71B650B370D146CCED885A26E173723117EE89DECE31FEF1E01

arm64—6E956A65AF0C30A6BBA465D41A6EC6DE208C1F1B756845BD645DE8E5922F80E1

139.0.4

x86—24145F398A11A3092BFAA590B9297EC89D71182A939711D1B27E942C77476A44

x64—A837B0AE18C93796C66C8EB5213017A20DCC545B273CBDAEEF32AD0E0A65DE2D

arm64—96560C30C070E379879F7D06709AA0D2D4CEB7F086491474052E4D4C24C446B8

139.0.1

x86—9B6E2348F3BDB0986C38AAC091947F5E219AE0BC764C0548B2611914DB2C4B50

x64—1C9ABF20292A8B01C372AA36E752A6E36D8264B18E573225635526492201D12A

arm64—B1753799FCA44A40AD12C3DB9357324227C680E748F677D13C6BB6A3299522A6

139.0

x86—53A89590A7C6103A3D27C2D85120B87D4CA2A74D842F85253C713909BDB92D4F

x64—084098EBC3A4CF4D13C3DC9360F6AAC2ACB930FCB49F80085558192CE6623410

arm64—475A0EAD1710BCCB2144A0E34E4E113B7E9E460838FC1D7E68DF8CF91FDCF4A5

138.0.4

x86—4D9662855C7895FB7AE422693C1CD509940F2036A7AD58318AE1A8127FBA832B

x64—5BB16DFE8B4981658882A2AA0B7646949F91515D099F41E748E7C9CED29EDF0F

arm64—997F00F853792CD47FA281C833E0121F9E3684B0039CCA978544EE5B7695B463

137.0.2

x86—A1383D0E6B8B2F98AC4E05DB923D2D717518989E354F0173260BA030B8A5733F

x64—21D2C82E563F386F57EB506D7DB1C43C3C173F8365972F0D28964F6AC9EE2A8E

arm64—50C929A47E792C14CAC88FE815884BB808C068F6F590ABB20D2A09A6AE089384

Mozilla Firefox (son)

Latest 156.0·September 15, 2026

Installer type: nullsoft

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Installer type: `nullsoft`