Name: Mozilla Firefox (cs)
Author: Mozilla

Mozilla Firefox (cs)

Mozilla·Mozilla.Firefox.cs

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.cs --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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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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arm64—A69745E12F5709A3D07F0EC8ADEEC42DE1B492D53CF7BAF2B28FD981BECEF3FB

140.0

x86—7B91E868ADADB63E15445ADAB00475A7C51E69454EA131C778C04AD5A88A996D

x64—5A7D7EA760CC429D9F24EBC046D777EC1EA91BD92DFDF937A75835AF3518C776

arm64—9FD154912EB4ED58917F6947161076E0C23F8138B97617C8C198DF82501E5807

139.0.4

x86—059F92A540B75AE2297FC7874BDF9B19EA5CC7B455C4BE4D12B0B06F19CBE910

x64—A9483CAE51DF620CBBCB36A6BB11B2B6BDA5705870A5BC500352AFCA2481D960

arm64—89B26CFA00ADB7DAA7BF1C190AF403D6449CB705DB52DF0BD8AC66A468F9B848

139.0.1

x86—B912BC5CB163C12034D342AC8DCBD7D7A11E1663043D267AE3AF5CCCFD2A131F

x64—21C77C1809EC507680D7B26B10A1F996DE57BF050B292110EE89E5599414BCED

arm64—16873ACF6F6BB8547827158051174D08773093E2C18A4310B18CA5281D9B9BD2

139.0

x86—E37925A1457CE0ABF42CAE9F74C14D5C3879BF96098E834BE5961EA9C2DFA4F3

x64—30898FC8D616A411BFAA3ECF37C7528EB1FA7113FCF432407DE69DD2330BC58A

arm64—421A570DB5F2DA6B205A6D789B44CF3477D41F72F84A1DC73CEDC1095FAFE2B2

138.0.4

x86—44D08B2BA62062B5A78AD36297B599BBDE5A3676F9C4B25CAA1634A819142771

x64—27521232426F8400188E3057EF67682EBD58C4C7E869C2CB43C8313D9BC8860D

arm64—4F1CD4B219CF01322C810E894FAB68407B39F87BCB893D1393F2615157333C56

138.0.3

x86—1BC372DCE22222BC7EF127299C6538F71418BB02388A0B2A9884D28D025110F6

x64—8CBEB8B5DD762B1195FB3F9404574329C88E641440C370B1AC9A71F5DA23FE73

arm64—A12E5A64F1FEC3B7D8E8C4620A9DE69826E0CB9E60A713CC7A5B5B11E3FEA892

138.0.1

x86—66F6A2A3B24778830C8BA064C3CCBA22F58C73E81534B27164B51E87F58ECA4D

x64—4EB1FF0B1CFC7FD0C37E0D4E9FE83A37CBE09AA2656EE7A27E1C748496972E37

arm64—93EBDE8A200B210324A2C7B1017DEE7CE87DDB08E296F449E0BEDE1F0D993D30

138.0

x86—C94F6A79C1A4054BD1E04344DFF93ABF014BB103520C9841DEA12A057F0A17FC

x64—78FABA56626585451121CB976C4C1E8F01499FF771285DD90BA4A194CCAA8707

arm64—B189003255CD49EA6BEE3754B461DCED050728058D6B65252A47F71DEA5E3E3C

137.0.2

x86—525C75F60BA6488AE015E3B2B3B4BFD8449C09A9883A21E276EA8A070FAAAEFB

x64—CBB964C1BD8769C52972329678606ECF1044E9A5CE5BABAD352C0AF0407F2F5C

arm64—1C7407508BE1DFE74D0F6FBAF6A7F88A5DF1ED26CF8F6FF693B14C495A10EEE6

Mozilla Firefox (cs)

Latest 156.0·September 15, 2026

Installer type: nullsoft

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Installer type: `nullsoft`