Name: Mozilla Firefox (de)
Author: Mozilla

Mozilla Firefox (de)

Mozilla·Mozilla.Firefox.de

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.de --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

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arm64—BF1CD27542024E363729EC2CA490CD3D10CCE51A52736A40DB2070B0C71CE10B

140.0

x86—FCE16128441A4DE9F941707E742ECABC2E68AB570BDD7776A388896E9D1BA7E6

x64—5407A1A4B8F87300DD5FED3F8A8EAFF0945AE8B2E044B78554C60B37CE9C6C56

arm64—F86D7939FE3A1A361E453B686C52B3BF293B85356B874275A83F7BF4CDEB49B9

139.0.4

x86—0A9F64E870CB63B9A1BDAE5A7DBAA5BD268836C79B03749FB115DE212C62EE77

x64—4732BCE7663F2492BC1D6E13BE06FBCDC3F3A482236B6DB76C639DD476BBF61C

arm64—926A6F2B10357926AA5496275F9B63F3A42AFCEC231B8F300A5962F4E3D07CBD

139.0.1

x86—F16D7EAEEDF2EAFC3993220AAE100D95548CBBC852F88342E05D1FEE0395DA00

x64—6A2288ABF8013B60A410B2941422DCBE56F07602567EC0DC2C01099494228637

arm64—BCFFFD6E96DBB5F654E6AD66B816252E7C535F2290FBB8013402063E2F70E339

139.0

x86—2C12A76291126D162EED8AAEDC6AA2C80B7650A04E8A3CDE58092F9AC92E6B07

x64—59E5711880CB8912B26B5A8FE63AF1641394FE51174714BC75E46A367DDCDA65

arm64—65EDD40DBD961CDBAA4F6B62EAD420B8E04C4BF6526D9FD9189E02366E11F211

138.0.4

x86—DBAAC6156681226626BC6A24CBD1783540DC992DB8610D8C254307B20A9AE9FA

x64—8724E04507E2C7D4DB0C464A006A329447BB8C3F93597B8724ECFBF4EFE9A8F4

arm64—638708DBEE37AC9E52F8F195A317B2E76958BEE7A19AE86BB1BF9F7C15859EA6

138.0.3

x86—C9BB306191C35DB1771B777C164685ED7AD21E068E74115ABBF9EDC42CD39A4E

x64—BF1A7D36572A5FD368439913EA0F70D7BFC8042AE8C27B490BA2301D4911C3E0

arm64—D952DCFCA70AC20C0F841DAA8CA11828C94A623CD2BD766186EA9F7D7A429AD8

138.0.1

x86—BF5F67D8A2600D2CCF0BC4F6ADFA5784F0184CC5AB6CD98CF6420AF08EA45404

x64—D473ECC60B9CC294BFE95FEE482F151E4930F347267F3171544C5798E86F1FF2

arm64—8E831E9DBFCC2110324C970445C9BE73F0AC59060764C7C0C649AC81D1882682

138.0

x86—ED5D64F4D07EC0E5E43992952650D1EAEC9CC609A0DE1D7F18AFEB2F046D5357

x64—63B4A1826BB97183064A00C658A65798FED95F8D2EC88FE22ADD24248CA7E3D7

arm64—A827CF0B877AD59D32C321BE8CB8CE87B534B7F8BC4772DAEBB361336D030E28

137.0.2

x86—405236E36B87225B3C17BA2B2DE2AE75FA7E71745725C4960C12BA16955A154C

x64—55F51E7426A64B792C13F4E8950701EB08C2EE48A834BC9D52E8DCD9E4D1B390

arm64—3636789DE15E95C25031736A28FD767DD38C2B97C7CE492089803F80EC4285B8

Mozilla Firefox (de)

Latest 156.0·September 15, 2026

Installer type: nullsoft

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Installer type: `nullsoft`