Name: Mozilla Firefox (km)
Author: Mozilla

Mozilla Firefox (km)

Mozilla·Mozilla.Firefox.km

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.km --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—0C71395374CD7689FA725BDA3779FD1D7AED86DD300CBD0382A1C29C5839F89A

x64—5EB49B8A9D5A89B79AFCBC506ADCA3A59592F2852C421650375AEFFE840B9B51

arm64—183CC23C08B342C5EC5C1B704B83031D4504941FEA704328067F0046BE851EB4

140.0

x86—50EEF99E8EC2C3AED74310CF621B60853C3C97EF77D84FC7D5AA7F8165BF12B2

x64—094A635A275998BA28D4CEBE1613868B2CCB4300CFDE55CFB4E7A4E7F532455B

arm64—31BAA2768E8AE5DE19979AEC497BB885BCC8DEF83E35F3745ED888E35EC67CAC

139.0.4

x86—28E65EFD4B0E41F436123E39A4BB8E856B1FE59CEE4ABBAFA7D968B95713C34C

x64—88DCD312499FE6CAB699804C3AED3B50BE327C099045AD1FC47923D404F95AF6

arm64—563D9A04AE6097A8D86357F2C3871D13A20D7C3DFC2BB9C4EC122E753F0ADF3B

139.0.1

x86—7B2DE5904E49647F0D9072131158E7B4C12AF625B43D205E6C60CCC7523C5414

x64—E109FD46104B25D2AF073E13E53711AFFE593446634FD92CE8F0893323CD8E46

arm64—AA69E067A5FCCCD068D0C0D2D164A72D18931EE0BDC4EAD7AB56E17FE38EC992

139.0

x86—64544B2EC4CCEFDBE1D833AC4AD7E575AEF3D25E88030F170CE028A0935D2BAA

x64—165EE69E98BF40D54C2F86F653AA81B21548EA2989B6AA7A18BF322F7B287BD4

arm64—D88164456F6989656D51D5EFC47B6272A628AB0F2984396E9C770FD4CFB24BF2

138.0.4

x86—2C96051844C82DBD4D4365F10AE119E0911AE0901FFCD9210455E7044E43F226

x64—32E93406B28A60C6C228800B2733799660477AD5D2DC86A052AC69478CFBC48D

arm64—382226DEA2052E330E655C61DE3522C7463F853E7A0CF592945DC34E59956EBE

138.0.3

x86—495F1DEC3C856F38CC6C49BFB16CD21E186D16D8C9CEC39F32C0EF7257EF5211

x64—CB415F529AE3D33A30B884C735235807D8C61D420B8C3B99FBDA9C34EA436C20

arm64—4089406A272B2B2C28018560D5DD332BA93B1A29BDCB5B3D72C8C845D3AEC7D6

138.0.1

x86—2CC51A546DF5516B693FBB2B681C06EB4D0186B51A3B8E53FE8B34A94CD8D607

x64—319456EA482E22ADFE413F989B3E1B8D8D8C6EB49DE270E6C893DC51FB933C9D

arm64—2BD902FE16B5F379DBF7DE7C63D82E22828DCF80203C69CFC8B64FB54C554EC9

138.0

x86—50EDF39429B551189DAC7E324849D92AD8D751A0BA8E9CC9D7CC4FDE37AE27A3

x64—EB519ADC80FD3F61CB2DE631B4EB394A801757124350C5C9216EC3791ADAF6CA

arm64—1118233EB8287638D1EB0AEA650D9F8FF42DEB275060576A92756B47B77DBE8C

137.0.2

x86—F1259662F107BB2380C7E96E4468E49190D5D114F748F74F72EF17586F6D0694

x64—2F6F656C9BC02F40AE5438B0584F9D431DC1F6A97B60202A782E13E849120E54

arm64—FBFD33163EA072D703A9CB8B3175522A5B01B927DFC2F769CA40D1BD2B513E44

Mozilla Firefox (km)

Latest 156.0·September 15, 2026

Installer type: nullsoft

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Installer type: `nullsoft`