Name: Mozilla Firefox (fi)
Author: Mozilla

Mozilla Firefox (fi)

Mozilla·Mozilla.Firefox.fi

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.fi --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—4C75FD699944ECB2C5B6638DC202EB3D200876D3CD300161AE0E19ED457BB308

x64—9A41765BD76F55C4D001E371EC1E666407B027D36F3ED7D7080F2604E81DFE55

arm64—960FAA6D4A1C3C4E985B7791D68AD172589C401CE817292B0DE1154B68306971

140.0

x86—EC4EDCA559938408C2D1ED00B4299E12A5042BE16D1B8590037DD9AE1A5ECA2B

x64—2F28991554689C12AC066B1EE435D0403A1722B903539706A66125C6BF4EF610

arm64—AA306D9D1BB0191711E56A84C8668530DEC5ABFC0312B498A150E6D85CFE5947

139.0.4

x86—64E34BBED8E4D576C4104024B50A2A6CF9D43CB6882D0AF949ECDDF6B0948B53

x64—9FBF45D29487002FA9F8989B6D99CFA0A1424D3AD96F98DE8FBEA6E1FE5777B5

arm64—536DD29EDB51326DE537B1FACA2DDFD2368F1EA7050A6E1109F1D31284B42E9F

139.0.1

x86—25AC02C677B86705AEEA4D552B1AA8AB42B570C59CD414F667B9CBBB91015D4C

x64—D21ED558A5E2539815691E422422B3008A67182C9FAD33B70737CD9942C0B4B9

arm64—13F7C880EC450349FD938626A50B0DF430A237C4FB5C65CE06F103AE1734062F

139.0

x86—6ED637DB9DF8C147A51FC1B7FECD67A59F2B65695A34331AF3815CA95CC1F251

x64—94C644EC420752DF87289EE2EDB84585850E13E31CD7612274B5A72A30F0B0AA

arm64—B1F300E60E5EAB9D260D723481DF91744DD0B8BA01A1236EB82FDD0D5D65DFEC

138.0.4

x86—96FDB8BF12CE5E3D8AC0D663277F22DAF4C027D1EDD085218256115DEEA533F0

x64—A86D17B9AFC0EC5EC88D78B4FD75377828E1655816E2D75E85CE489CF4627605

arm64—D8AB4600F08DB1DC3C5A30C604A6F270B08D76586C331CEBA3C08AE85C6522B5

138.0.3

x86—1DF9D90E5E113DC841569DACC5DB61F4E6FCB666AA22A78FB11A305B93EB98E8

x64—A2A1E1AC6ADB138734BC122AEC6C06E8EA2E7DF459AC7C3E65C7F4557EBAAC29

arm64—65ABFAA99D3531CEF7BCE9BEDB2608231FEA36E246CCFDD6A6A0A28323928052

138.0.1

x86—4D417D48CF16CB5EE07C6451EB8E6691BA7C4E4B8820DE3CC541F8F6BC638DC1

x64—21655C4CB4FA2D0E3553256ED0779DB8B5248444EE4BEAB989614356ACF1FE92

arm64—8635F24BB5689D3CC245F87D5080968AD0D63077D50FF6A148C9634F62A38584

138.0

x86—ABA75DB8BD3385414EE88F8F97BDF2464D398DCD05BBE61B7C64A8C5DB966A14

x64—9FDB8EBC54AACA9A552A662DD821388081DD23614A074FD177D92D0B2890A0C1

arm64—9640407D61D38FB345828C8A8A107B3512E4A166041DD2CBD28B92EBFFD83C20

137.0.2

x86—6D7A2E0391EDACAA1630065BBC969565BC143E7487392A2850F7CD60A9477726

x64—2FEA50C9EA6FD48032F23A85C175EDC9DFD1BEEF451CE95C9EB146A45FA4DB6A

arm64—EC37563B46986898BC6069146BB2606CA369C41E8505DF49B9821EED87339B6B

Mozilla Firefox (fi)

Latest 156.0·September 15, 2026

Installer type: nullsoft

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Installer type: `nullsoft`