Name: Mozilla Firefox (cy)
Author: Mozilla

Mozilla Firefox (cy)

Mozilla·Mozilla.Firefox.cy

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.cy --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—B1C8E87744943C0DF6B81B4ACB781B95162268DBC5C86AFEC65703C4355799A7

x64—B2FAAC7252AC70265C7B8DE3C0DB477026A82DE9FDD1287877A23530A54119A3

arm64—866D1561454C988293C53D255BB689BF4CA64E1B266E8DA9446DAEBAC128701A

140.0

x86—AD7A5C886618C4FDA4A1D6EC839FACF4E4C6A7A687DF255F2BF76BD1BDD34022

x64—62110162099E7AE04A38BA15D04D0DE1237F39D1799D0313683757AA3F7DFE27

arm64—728EAC9EE3273D909E586422A060E491978244338A95F526F4ED87A2FA6F59AC

139.0.4

x86—190FF19BB4A17CFC73EF9156B106188AD40EB7D8FC6607F542F3B9B391B5990A

x64—D0FDBBE9D38CD3319F5CEB25E158337064527CDD88A755D3D8034332295473C3

arm64—761083E7ADC27DC49F16B4941B899BE584123218421D0C4954BCBB709548DB62

139.0.1

x86—2A4FC134F0C39028B67D57FC14EB940510B77CB442B91A711BF1275B9ACFD37B

x64—75928746220FEF3E3C20B396E3859758A10A7A18A970719F60C68ABB62D9AC9B

arm64—680C24CCFA69FD49D5B312B7EC2337C316E8184B8E8DD73E89E5AF0CDBE976FE

139.0

x86—7287F3145F8204B446D94BB644615515AA049F0DD3DA4962F5E1BD0799F11210

x64—8126D743EDACFD627F16A27E33B6761569B22CE4E51233BA5CADF49EFA834FD0

arm64—7025242E8A0591B12BF6F3945E9D83FF70CA86E81A0CADCBCBA695C8F466ED25

138.0.4

x86—34B4C0228B7C778E6A2F310103AC52D83C2C76A48132659AEEAC730A6041AD9F

x64—727549EE9EE3CDE8962C6B4DE1772756721A5971A5D8F70DB2817E59E566069C

arm64—8F19B9783A304C6EDEA7981968FC256A4BFA0E53AF2F0936546982B99F14393F

138.0.3

x86—5DA5CBC7406A2089B5D27B8A3BDE093A5022D87907751C84659CB0BDE219B1B6

x64—8B9BCF72A7CECB45941AB883A9379E65CA077841D3269B078FC75EB51A171D82

arm64—A7E4A62B9DE8ECA0733E4CBCD7B4F71636C0D7725D95127E4C4E3C71798F379B

138.0.1

x86—BDE1B2B3550920FC32F1DA3B55D4E012AAFDFFDB8409242C9E736007C18B5F98

x64—AA4AACD0AC9C61363ADEFDE93EF1B37B4D68219BADFECC9BEEC73624DDDD7C76

arm64—DC27CF607A633C9B76A037ED5F55312927E52C37095D81364495E2563B4A5BCE

138.0

x86—5F8ADD80149F500C7D30AC85BE529D16EC0EEF5913664C3BA104E31DB34B0D29

x64—637DEE21C61C31EFB635A718AD376310C16AA5EED90406C209ED3B79ACB03217

arm64—B52274006BEB8B4B78C854B2E21B7A4BD215BB2DDDCB8B03A8FD12018E3D3239

137.0.2

x86—D01ECC45520F819E03B777D25E7969EB41DB9218C6A153023657F8FEDAD63ECF

x64—AD8EDE42D80D507475ADC09A27972424930B7D693AAB0C1202013CAC6DD0F174

arm64—4A056D2D750310945B2F4698E7C71D108E267F99A15CD83455F3371316A2D259

Mozilla Firefox (cy)

Latest 156.0·September 15, 2026

Installer type: nullsoft

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Installer type: `nullsoft`