Name: Mozilla Firefox (ms)
Author: Mozilla

Mozilla Firefox (ms)

Mozilla·Mozilla.Firefox.ms

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.ms --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 (61)

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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150.0

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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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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

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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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arm64—4CB4B2832D646A3D8362FF3634DC53038729B3F1B0C0901681FC959975D790ED

140.0

x86—4E94F643A4D133E5921A70BA8CC8CC44EBCC9B84C7A307E9398205BC248FB9B9

x64—7DA802AA327238B5424E078689B659307174DBFAD1DDDA0B1D67B4EE291A873E

arm64—6989CAC489CC41CD7A09B20B6A5EBCA9FEECD5BDD00D8E11DCF30C1699D438D2

139.0.4

x86—727D2511CD5CD135CABDD0060E6B84AFCA792B9D69E6011466BA9487B578938B

x64—6A4E55680CB740F3D73A15791298E6DE38AACF8EDC484B78BE6755C6BC9419B6

arm64—91CA7F1D2AAD9E366DC70E17C4B6BC821E8FDBA19AEFCB17813129A30EA41908

139.0.1

x86—399123193032BA813005B3369AE51C5B23991C466379212010A40E1EAEE547BA

x64—B5C2DFCCF467E8E6BB4D33F9BA82BB284BC5D6510092D280B7B9611E27AE1823

arm64—9E5EC3A168DAAE0811FC9DEB5B3C98830C4D5C91EE723E5F8A582582A22EE9C4

139.0

x86—00BA36A69E795371CA1AB6A250F766656B0F3DE2B73EFD73CBECF30BFFEF4C7A

x64—EDA3EA9B62B297982B56FF1CA69DA2CFC0F136A6FCA56D4D5BB4308814089884

arm64—D20047D8333878DA38CF025F8ED70D4D495B3F3CC0BFB333E225C4277E034863

138.0.4

x86—63B891A28BF80592AE0B50D15BDECDEE5CE73EF3CD70D03B190FD0FACA31A99C

x64—90F01CF4700C359CAB7ACB37B45463A1B238BB6EDA8011F2A3C948B812A1DEA4

arm64—1A6D0A1790C84503D564F45BEF218BE5663F9F3A6E1A92FE33F8D5233DFE5410

138.0.3

x86—8F0A48BE26B6F8E6BE44235FEEEB624FD77F479E33A8D906BD7286FC4D6155EA

x64—A19D34D53E4305F1CAE28C3C9E1ED1A7737716E93B7E951A1E7259FC31539EB5

arm64—46EC3CA7DA73A9CCF41ACA4577A9555E6B38F9A70E3070E455EE86F7DF8B4869

138.0.1

x86—C3097A04888B2297F2A3261DA7275B7A38B9E717380E0AE6EF71C6B76D81E72B

x64—5B0EF05541D1B745C084C15B4200D65452ECC9495109286CDF86118B7DE9A5AE

arm64—A94A86E947DEA9F7BF03D3A63351082754E635003AC7E2E6B1B449BB447DCF19

138.0

x86—3EC596EF78E56AB705EDB74B5DA742702EB0461AB2F1DDA514B0FF9F033A6FCC

x64—67FC4C4F40D50FA12D3C8E6A99FE8B0E8E52C8C983BDE367E0D3B4C77F45630E

arm64—6A28B893CAAFE001EF13E0ADA245558644021E2C30BA6DD6713ECD043ED2AAE7

137.0.2

x86—0AE772ACCE9C556F64ED8D3E863239B5FD442DE9BD8C15B4862BC5AA42AC05A3

x64—2CC39C5F26617F06328D53D3E7299E3567B243BDB78A1A6CA7D55580AE536AF8

arm64—8A1E4A2C48298301347E2427CFB8F41EF13C18D3D911EA5909755E847CD3019E

Mozilla Firefox (ms)

Latest 156.0·September 15, 2026

Installer type: nullsoft

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Installer type: `nullsoft`