Name: Mozilla Firefox (id)
Author: Mozilla

Mozilla Firefox (id)

Mozilla·Mozilla.Firefox.id

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.id --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—D6A5584EE5EF777EB3E997E8B41477ECA924703A5C2CDF96241B34A3687CCE9B

140.0

x86—97874E8E8C799E870EBF1B1318A844467253AEC46DF3B0B8A602F315E0201847

x64—794A896DED1050D6E08A8EBA2827937C994E9D01556793D44ED80C104A93682D

arm64—97D49075CD75A537C7130CE27890174C0FEA9FA75902253E296B14D99EE7CD50

139.0.4

x86—46E5F9BD25731C9D14DFF72BD4047AD921B5FF5F463EF54A61ED3E2D7C78EAE5

x64—01F16C4155E0AC3B054709E86848509B39E1FB8AEF8BCC5572FC3938011CA825

arm64—D706E096893A0D0A1DB0EC003F47F7CEA41D89424EE0911BF328613839DE857C

139.0.1

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x64—D47CC13100EBF5AB9B0AA8033AF835475FEA7845C56780F90B14EBB43A283F1F

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139.0

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138.0.4

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x64—EB17295085D9F7F1F5270E1B02903B1899E9ACD6224626851EE98FA7880D1596

arm64—DE446CA55C7B177701C4B8DFE226114AB47EE929FE64D14ECCE197D7AB824381

138.0.3

x86—601010063D3EA0CD9F4619B9BEA9E82B590FD77264D0ADC47CA8DEFF978E6295

x64—40D20784D7FF6D1DE4A13B6F7C9E6C4AFF4B08CDD027554E315EF94B5689ED06

arm64—CE6B89B208BE2A56256D20ADF7E371EDC600502682BB0E8D84D88EEF8DA35B4E

138.0.1

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arm64—85724FA89F35876F57D253D732631DA25FD35B309A8407E3E334BE1BFBED1253

138.0

x86—022FF93BF786AD72253EA0DF024BDF53884EEFC8D90C0027AD17A13C93155D7C

x64—3096AD2CF771D2DF45871CF0E66F6A396BD30790DB86D1A6CE3FDBB286DEB711

arm64—EE2E85BB5E7FD1733B676C5B02EC615BA2995588071C8E30917502FA91D0517A

137.0.2

x86—00C273F770FA5B5D74F6D8CA8CD8757D6DBF7F05B27D61A81A57706C7875BE9F

x64—98F76A1835721CE290D846AB7E27E5BBE73FB671A33DD3123071284CD69507D7

arm64—1D78C61A291AC9F82881A74914BDFA96C7370065570B8D3905FFE9437DA1A2B1

Mozilla Firefox (id)

Latest 156.0·September 15, 2026

Installer type: nullsoft

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Installer type: `nullsoft`