Name: Mozilla Firefox (ja)
Author: Mozilla

Mozilla Firefox (ja)

Mozilla·Mozilla.Firefox.ja

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.ja --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

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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

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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—2FBF5FEEA3E04CA730AAB0A79A1C55F47D3EE6ECA661DAB2FC780D0B1E3A7ED8

x64—0E353C1C33FA4F8898F1ECECDC5D464D439237DAF322E30C1F28637238B16B1E

arm64—EBC7B787933CF1B5CDA3D8D38C4F0A3067DFC6157514065289BCD38ADCEE0CE9

140.0

x86—25ADC1F28F8A7442B37AA0CBCF82AA5967FA052CF2D489F24493FF174A01019A

x64—A5BB23EFD4DB7739E032677DA66F2CBBAB12928E8003467FBA0455E153253B3A

arm64—E1DFB138F0E91C6A5324A058FD2E80C47A9FEC03446F88C2E39CE5B0084DFE88

139.0.4

x86—29256CEC2C2E658A968CE907A03E79E4751CC98958EF25347AD0E6A96035FFCA

x64—5D4B2C10094D47568F5A47B699DCB166E118DDD46EE830F3041339D730011C08

arm64—88FD1A4107F3067126551EA3B25ED9BE8118DE45C3385F1EF754D115BCC288A4

139.0.1

x86—B5D01CE14408E754AEAB1700280C57F01D106C1280E1F2DDC8ACE2C7D2BCF4D2

x64—8DC50B8C9CAE49442B7CA175A62E71796B40B44660D697A76B2AA6E2FBB2BB0C

arm64—AB1347FF47AD421937216CD429AE2BDA07D5591EE08928154C40AEC15CB40047

139.0

x86—F28853347BBFC194C0C2186EC10686F76C143B966DD03163E7A48B5262A89C26

x64—2C0BADDB89020C1AD15E316877E1BE63584A15A9C285F884C67907E269A63F17

arm64—A85C6EC8C8C9B1AFD803379861EC30ECB9926A4A9B27141DA3487D3219CB46AA

138.0.4

x86—C2CA134B3674B6BB85B017B496248A48BC8AD275CBD9CEB418C49D6E1294C54B

x64—C0E6BB70D199009D9EF54EAF67666B4D69C800E1739E61D6497DC7D5DED86376

arm64—FC01A1FA49BAE71230F23C601CE63438223BE6F12FE0A5A26FA940B6556C8781

138.0.3

x86—9E1DCF3EA2F44876A63207A8BAAC66E77B4038A5CC2D7B5537E1959B723F3448

x64—D4DF97C2C44D009963DD2789CA65C11D9DE3044677BB8051F27B4A2C806BD7C7

arm64—18D831D0C3A4AA515FD3644B5BBD266A933F3E526512B7BD251E4E1135C43193

138.0.1

x86—18644B28A079E62F5D6C05AA2ACC92993244E1FE27B729E339114C4BD0A618A5

x64—7CC0C2EDD852C45535608E58D0F86460A25AACF87565BF8CC00DDA6E66C1F7CC

arm64—9C108D408554D79BB4BC3BE8CC5670949999C79F02E7AB25DE7D8452216D75CE

138.0

x86—6CECC78706A4984CBB0F55F509518C584646CDB4037B9864E7A8E48AEBD05119

x64—7A89C7F7412DD41035B36D840197F5B25CBE40D78E36CDDA291613D6FC5BBBE8

arm64—428FF4D79D877C7674C30A704DE2BCFC27D444EAD0FFA6C2833C34683BE274BB

137.0.2

x86—A26C881C00BF20CA6AE36F9103E85B9B0F45987E1C6DEAEFB37C79F86F233BEF

x64—4DB2B6E9894342DA870DB91441815B722B5CA76D0EDDD37C2BEFC74B9EC54B86

arm64—479C2E95ABEE5D3D42514E376C3DF2607BED624F3EE15BF7D21D856756442BB6

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Latest 156.0·September 15, 2026

Installer type: nullsoft

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Installer type: `nullsoft`