Name: Mozilla Firefox (br)
Author: Mozilla

Mozilla Firefox (br)

Mozilla·Mozilla.Firefox.br

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.br --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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arm64—06058FA502C5C3366ABD37DC9E45E5F3B14FF09A695E8973F8E0022ECA02D12D

140.0.1

x86—AF092A8749872A58AF37DF3191167AE16CB3FD5CA7844747E105C9231DA73040

x64—542CF646699CD095DD681D9DDD056398CF223D68113DB6EBE4800DE948EEA657

arm64—3278151C107F40717BB1CF9BBF94E27CC4CC62E4EAF3D3B18A4FC5239A28047C

140.0

x86—9FC26D1F14277A479629AAD79B810C41BA3AD115727DA6CE7EFF4ADA1941536E

x64—C61E5C8A166B52451E6535EE590D061B9A7B37FA390092E2EC5F47F7EAB679C3

arm64—9083AEF9C48376127ACB1626B98824AE841D7D2F73B1161392C740F81823FEFD

139.0.4

x86—69DEA901B35352843E45342A5A1C875A8577C79BBCE448372F9E5A7D1777A539

x64—D471408AC68115694F397EBAB9AD0A8061E25F1C83C73BABD4CC40C67AA147EF

arm64—155416D7541DACE53A42E8076457B3FF960AB047CEC1A3B66A0EE232D95A07B8

139.0.1

x86—BD0F7647963B615362E54A8EE1C512775653E8E94485157B221370DE78CF4D30

x64—0713FA3F932AC10662FCDB169A292C1DB919AA6F02415DAE91A7BE9612573D30

arm64—6637906C8519B3F0353C41D4E0656EADFCA1B4C5A843AEFC82F4EE7F1F07BE1C

139.0

x86—45ACEC1E445D080E964149F2ECF2F2F1CB3043C64E9D497A3513D171C859E318

x64—C7069FACD39420E4AAEE2CA77F1C9A05B863115D61BB20459B9C6C0334FD735F

arm64—5E633687953D54DD7E2CA9A0D948C2D5676512767BFC3545AA6ADA654A6D0C6F

138.0.4

x86—88EC735BF6637188B75C09A3B5DA97BB6423721746AF5BF2CB9F86E0CFC53C75

x64—BA155F17781C7279C488771C6D893888C0569FD8E043329B8DB02F191609B879

arm64—3AEE0D246FDF46D42D3980299140D4FD2E36C6A46F325F96A391A635A566D4FD

138.0.3

x86—A0E1B2F4EFDDA19472BC2C457B8E01708389ADD915EABDE6AB283986CA291B5E

x64—97391F7B4939B6A1EF34ACA392D7DB2179AF604F794E6F300361A1AB25A03B72

arm64—CCC8FD88DACA49D2992AA2CB80B560B73672CACF5BAB4CB84CEABCEF20D409B9

138.0.1

x86—C39DEFD5808E4FBA51A1A27EF998EAA2FA15266D00BDC391FA2AFF17CDC5A691

x64—FEBB45AF2583A74C55B0FAB06DDF07E9850D9631613A452583AEA4CC43B61E7D

arm64—37B6B9E0CD49B5F127E1FB17E10C16167D56BB8C77E3C1AEADA505DE1D8A353B

138.0

x86—6136A2A0D557E925728B79F3C225E648B7E9AFADD7B4A51DBB43D52E42BDD218

x64—9D354E8D909E2AC6615C35C69D772D690DAC267F1348B64F12851772C724FBC2

arm64—11F37A0703B4748BEC7A31038BC0DF08EB7F844CF732495233D39A97F2B399E3

137.0.2

x86—A6FA14AA9321C1DCFCD014D31FF33140E8847BEDB29B6451EEF87F0F09B46593

x64—6BD0E911E137B03CE6B29B45467F4FE675D5E535C90A93D7C4A163B1719802BE

arm64—67353776FC754BBE5150E5C272AA5D776DD003E8F4790E6C04837A5BA4D578D8

Mozilla Firefox (br)

Latest 156.0·September 15, 2026

Installer type: nullsoft

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Installer type: `nullsoft`