Name: Mozilla Firefox (ff)
Author: Mozilla

Mozilla Firefox (ff)

Mozilla·Mozilla.Firefox.ff

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.ff --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

x86—488AF2F310C0EBF137B48CE4699B91F54F802E0A8D32F7AB0EEFBB90D1A3BCC0

x64—1C066C42FAAB4D8DCF8812A0EC0DCD38B5AAABBE3F0FC215B5760861DE4C636C

arm64—B89B7CCD38E2CF1A7EA249D5C487E30821FCCCCF63E5FD29082EB4F57CED3384

140.0

x86—DA037971D910C8E9073B5E151C122391EBA63F84F2F9B2778093C776E17A5DF0

x64—88E6738DCB2AC4ACF6DC45AA7EC11B7BF0759FAB01765E3963E059E659D51F71

arm64—580FC7F1669E0310869EC1B6C01E45A2DE48B5323CC00FCCA0DBB392054EDF57

139.0.4

x86—730C73058F6F0EF1F11CE0CC3DAC7A0E5E1E7E51A53BE47F33C4534E47791994

x64—CD82080655000430C1B362AFF6636AEB12C60C3059B644E35F782474BBB1DDDC

arm64—436776BF4816BE6FD3D797BC6AB33FC3F4BB964E30744DEAC67BC9471745236F

139.0.1

x86—382A243FCD9C2F07EB9B6A67B8EB999D54E29666BB2285ADFF134E29E287B01F

x64—01F437AE86DE01272DC2118E0E6D2EC79E689E00258ACBD13633DBE5D12C6042

arm64—E8F5EA163D63FF5B0125F841CF559C3F0F3378BD28854DE398173F4A92A67F83

139.0

x86—A66735A075F5A76CC64DFF1FE3637B4BA1D341C358DC0CAEFF73432077C1FD53

x64—D4D61A4524EEF532CA32B36D7E462991477A6671CD06C7227038A0447A9DE0B7

arm64—E1716983042B3D661D1AD51367666D0DB30954ECEC0D48F0A93104F3D0EC6FB9

138.0.4

x86—0C2C9E6F43E092511BE9FB6AE5F1BDCBB4134F233DB1796BF74ECB8AB35ABB71

x64—2286DD00517BD329905E0D6F0834329F1968E793719F1B8E377A8FE9D1973D18

arm64—41F3937247F2E500313AE837DE692489728702D5C62B41F0FD0859E662BCFCBD

138.0.3

x86—3F0659A22D6904338C80597C6642335DCACF81C037F6C985E421756A2CA94F99

x64—B45849E0FBC107A633D644ABF559585C29F2B0DD86A0B0E7CDA4EE1039789B4D

arm64—2909B79BC958021CC93472C37E6FE88D99C4C7AB66650CFF5B4DBCFC6ADA036A

138.0.1

x86—D27FDE9806FF86E0E6E716232C09949254E1BADF765CF16AF8910F2A0C81D000

x64—5FAD1288520D7C379DC0E0E063666801CE558C5145F07776408C4F4CE89C7523

arm64—777C9254D9A2C7645A193F1BDF762CCE3FC61ADD13B9B0BCDF61772A23CFE2F8

138.0

x86—FFB547202222566AB71D4C7CA67B25F9A7A1DCCA3EEB52308A7449129C25CF12

x64—F16F19A9CABEB6DB9A3661CE535795D298BAD6F9C468D7E7FE7A815B52D76562

arm64—9253E4C40CF103C430A9AB253D71B0BC076C5EC46556204B26D739E65F04FA08

137.0.2

x86—7103623C90438A74815CAF26EB61F9A0F0173E0B35688CD3A33823FF640D1459

x64—3A27F77491E82A735658A1F9DC991124AEAE9826AC0D8A9310091DD7CB9D359C

arm64—8DD1CE3A7DBDA50266DFCD1432F71EA73DF04D671C296C7F593ED2DFE5ED91CC

Mozilla Firefox (ff)

Latest 156.0·September 15, 2026

Installer type: nullsoft

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Installer type: `nullsoft`