Name: Mozilla Firefox (en-GB)
Author: Mozilla

Mozilla Firefox (en-GB)

Mozilla·Mozilla.Firefox.en-GB

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.en-GB --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—79E4AAB381CA7047D007E9FB06707C0EE09FD1D3C7F61E821BD55DF4D513172A

x64—A0BA86CD47E4BD8E63C583AE586D428DF4DF4054C6CB8A9A01405061F563279A

arm64—A6A988EA249516F8038C62AD8839EC2B6136309400A47E9CBA8E7EC282DDB0DE

140.0

x86—AAF9A5EFF24B05217A02FC37CE32701A864D724E468CB74AF5DACB4E94F2A42E

x64—45C7B108A74121C149DC02D2CBAD457E21F234924762D8A80A10121017A42544

arm64—CC8ED676CBC351079104DB0BC4EED5F03B842E54A0A7DC00292C686689B6E2C3

139.0.4

x86—1E0A3C7C1C81C406DFF2FD58E019A3161EC4CA461445ABCA9F092BE3441286A8

x64—243262473D7AE6565D04DCCBD70D6F5192F838F464D0E96C73BE8B8298C74320

arm64—3B5F18C9FD694E67E4DF3119C03FA1D963B95C7291E6BCE40F06FA7F3B76C8E4

139.0.1

x86—8D1C68CD1DCB7DF324BD79787F4A9CA6AD154F823B31EBBA75B5F040A45BBE9F

x64—4629360C0D3473B8E657908311EC8FDDCAAE8E9A6F60EDF825232EF87B8F47A4

arm64—03E80086EB35E79D101258403B027CD184E41A5CDD741E1051148D5B84110BA3

139.0

x86—57B4C628CEA1EDE84A2A3E52D7AC20CB0555C610BBE8BACAB18FCC81275A8EC5

x64—BF9A119852F4A1027658129DA77F8B442E87DA2ABA1D896B83F30F863B7DF446

arm64—74FFA1ADEE843C943CE2A4F47AFD98208883EF1500EE22408065E59DBD3C58A7

138.0.4

x86—8C10D3E349069D3ACCD7FED0A24612D544BA8DEB8096808B019CCD1F44FE3AA9

x64—960CBA62CC07F75921AF385E1217FCC7D68E2A5F1E51F52C2EC65A4A3941167F

arm64—EDDE19CAA135FE776DACAC211841EBE2BDD7AB31B0E7D3BE106BAAD05047E642

138.0.3

x86—5A6BEF2AEA35006EC606BFA5C064962800C7082503782E5A96BA170DBD6417B1

x64—36227FE8A64374D5C1A454398344C194B9FD503F041373B09457BBEB9EB1428A

arm64—B17C6CD236DC07E8F522132DF2CFA405185E4AF3E12187194680A118AA27AA7A

138.0.1

x86—2395460DEACB06DD5127265E19B4E70EC58408A9D945DBBE6DF52302C89C4733

x64—02A7C250BD13B36EA1979C70B91BFA37A3E0521529E0FE5A2144E8BDDB42E460

arm64—F53D0599E748A84A08818DA79EB718F1A6A1CE977E043C7DAD116CFD968759B5

138.0

x86—1009C97BEC9DE3C219F78A2A81F8DD051FF5F6B6821973780093530EB7119A2A

x64—7E4550530CE0FA5FD14B04AE556F926E436C75E18E45CDA7C090ADEE5E2D9603

arm64—41411AA1F6A011AFB6C7A48F08DB1FBC2CC3C7F5D10592BE992D3C3EB6299D0D

137.0.2

x86—EBC0B83F4C0E3DB3A11B4B658759DC65608DF32D00E8A923E0457DFD3303A637

x64—F37B00EBE989B04D987596D59774FD040EC9F8BF00626CE9A5B422C86846FB47

arm64—CBF37D585B171F92F2926F6287B3E2BD2226E80950C63379B542C6006F374AE7

Mozilla Firefox (en-GB)

Latest 156.0·September 15, 2026

Installer type: nullsoft

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Installer type: `nullsoft`