Name: Mozilla Firefox (rm)
Author: Mozilla

Mozilla Firefox (rm)

Mozilla·Mozilla.Firefox.rm

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.rm --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—058E1A762CE601684BBCC3B11D1F1A72ADE8A3C5B11E97A80F40B5E1035D6F69

x64—C97001557A0761DEE3633CD3262DBDCD3744CC76AA69DA27937ADFE6F89BC371

arm64—D93244B57A50ABE00312795169D63869983F6906838528D5259B78FEB2668021

140.0

x86—39FECDE1B8A1F18ED9ED630DF4188B102608AE8D0DF09BF0CEE30190F919B6ED

x64—63A357EAAB7C81398A31F4D3EB14A4585D571886BE0B28CC3D914A240BDC0472

arm64—D2AA2AB94892EC9F4C379025C07D4E43EBCA76120200601CF11BF37CDCC07D43

139.0.4

x86—793B8BF42543450AEFB8D9CF41C2420E2E103823EEA145B40A0A4CC91E909687

x64—9B1227F7E2F4A882F3CBFF063F1BE89E3CD0205B1F77FD7E2C78A1E57DF0DDB5

arm64—F0B52A8F8BC7D0F5A4A979ED7E47B397CB4025BD4385EDE9E4D2AA0A4C044AF8

139.0.1

x86—4E83EBDD4175907BD2795737CB55AB70E7EB959480A8A4557B82DD245B7AACEF

x64—9575C1562177F7DDC744B16ACECCBB2E70935ACD5B3DEA4DE9FAC2250B378A49

arm64—7B81A0DE7330A92B87C041EF76D380AEC306E84FA605E84C0CD97685D375D1C3

139.0

x86—CEA6624BD573EF513BE64A350802416C8EEA8FBE2AD521DED1ECD0863E07BE7E

x64—C5329A433840D4D456B0566490DB58FA63FA0AACDCBF36F852279FF3AD3358E9

arm64—82B75BF8A047962A867D5198A240F90866B47654B7E6AA1CAA378CB7A7D21FFA

138.0.4

x86—D2FC5A752937FE668C91B6B8BC727D434F40978010DB786CACFB75F26D666BD3

x64—BB689B5035E8597D6F427A8797A44C7A8912A3F49EA108DB8F97B0E44180C93A

arm64—5C55E368DCF19DFF86093B4D89D6362666673AA68E7B20B2D8D7BF48C338AC23

138.0.3

x86—6607F06F68C30F08496D9144E436919F75A9B86BA7EAE0AC549052577F81D472

x64—3B47B8E0C802F54A97BAAA0F52AB946FB88F2904F0236F9E6E47057DB94374DF

arm64—D32AF1DE2A7C7D16A5D4BEA896D15F5A09C96592F878C9DB712FE127185F3FD0

138.0.1

x86—7CAC124BD6F906E982AD46A8B4C2848F07BD56E6D0B7562A555D83AA49D5D290

x64—CD72F5B11643B66EA8263EBC6BAB52D54EBBFADE8745F36E9046C250949F242B

arm64—CF89DFB82DAAF36CEF3D7DFC18274AED84582CEA8AD8189CF00FC1E52832B8FA

138.0

x86—A2B283BE598CF95C8BD2938F0F21BA0103F3BBF23CEFFB17A38446D94A53BA67

x64—FFB12B7615B448B8B5F8A0BE7D0B6C4EA0A7AD8B77BFB73E43C2DD066DF0226E

arm64—448FC8F55FDE11CB4814573D8871C54F7A9E2872F642E3DA733CFD6DB88DA790

137.0.2

x86—9A41A073EFE244DA61F0FA55C433CB248227F3AFD3E1402A7D0E22B2F1E94245

x64—604E7115FCFA02EE0FF1C2C5D79CFCA47F1401752885828D42C31DFB15F59479

arm64—7A209A92BEC28F5C0D5B054E77BC8B281549AE8CB372BCFE73CBFD54EB9A46D6

Mozilla Firefox (rm)

Latest 156.0·September 15, 2026

Installer type: nullsoft

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Installer type: `nullsoft`