Name: Mozilla Firefox (oc)
Author: Mozilla

Mozilla Firefox (oc)

Mozilla·Mozilla.Firefox.oc

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.oc --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 (59)

155.0.1

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155.0

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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

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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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144.0.2

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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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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

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140.0

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139.0.4

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x64—0FBD98CB55F2094B4B42E49EA24FF1C9C1435934965AB522D5D1010C3132A412

arm64—9C270D6AA3F0E6B82C2971F39C911BD477EE61D074B7BB75A710F34DAFFA540C

139.0.1

x86—B5082C71B24DD2F6321AC458079433B908DD7750FE64AE8044DFE35F5EFB0F35

x64—2A5AD58B80DA4C5A8CAC1843959FE1BAFB2EAD07F298F0894DA90A57DDA75C52

arm64—680655E8AC41D785C2252A3422F752E59977764C1BF55ECFBB5E4200B2E8E8B1

139.0

x86—5C44BC92F6B71D6706E86A1868974341019F759BC23678DA0E533C3313221592

x64—E0A1DC74D2FDA70FE11993A4EE1BF62DA8F8F67ED10945E4246323ADF992CE19

arm64—9738027EC808CD1D59E9A5D9A4E202F3315A0334F098C0431F75517C5AA0737F

138.0.4

x86—341CC4FFA63395D1BBF38835025D2BBF62ACD5D492EF61026B87CFA804F129B4

x64—EFEAD10CD829D8F6AC629C715DD86E817D3B24949C3B7A7314E54953B108EE27

arm64—82E5DF9A216717C750BC290C015DDA436D31A13531B9A887138CD953E44C17C9

138.0.3

x86—04BA721297778442984BEE548B4E5C487E22714B3E30C42C1C2E853445F9C06A

x64—59ED81DBB5FDF6AE32C513C6F8883321B3F7224447E474158F880500B1C42D2F

arm64—D7AF6EF81384A2CD6C3E6290E128EF8E67183CE2C64637087E8957F8BEE36E09

138.0.1

x86—8C5416762278EE86AC90E2DEB4E4D72C52C7F7237F8D358FF37106616BDC8DB6

x64—6791B61378CC51A00373A3CD94A73C27FC4D11A21C58F137C916CB61EA97BBC5

arm64—D5A6B4D7479E94CFF3615E8A7D2BA8D7ECA2A54D23AB1A983FE2FC5EA76D3592

138.0

x86—C9F672222E4683213E68CC9995F0C59205D1154213596B7FD13567588BD6040E

x64—6475A4BB03B3B49358F29F02DE14E5AAF976D2C2A656EFC747035BF4521179FC

arm64—3D80BB19065638F1F3F15DE40EC35DEE40C2C767521958CAC66F2A7CFF5E45D7

137.0.2

x86—BAD0BAA13A9F64075D84394FE8B8571F82CA1838D86804E53C01472EC8CCC5AA

x64—5A90D27FEC0C3413F5FFFC10C6E13097DF2E43C2A986D7DA5DCA0AFEBBEB3309

arm64—1F84BEB974C5DD2833ED4488241E411C64125C06D92213FEE1C4B2ADCD440EF9

Mozilla Firefox (oc)

Latest 156.0·September 15, 2026

Installer type: nullsoft

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Installer type: `nullsoft`