Name: Mozilla Firefox (is)
Author: Mozilla

Mozilla Firefox (is)

Mozilla·Mozilla.Firefox.is

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.is --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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arm64—50322AAE215ECF4A94F80F3CCC1FE76706958ED9F3C9CAEAECB1E18D32DFBF01

140.0.1

x86—35AF8C88778AAC557C10D99B3956E0EF61CE51A71920ECB50963212024481285

x64—8D9E721EB2D0CC7205DF2FBCBE3A6AA1D3F323FCA261CF59BDF17FEC848C4BD4

arm64—0979B15EE484258E8E22C5D8E5F0418D858A832311B052DF05CDF0B351798F63

140.0

x86—F241B9F5CA6EA6395FD16D9D8AB06EF9FE8B98BB6A178D8D23DDAAA597900F55

x64—75B2D7E86DDEE4733D5DA3D4C52AF1179997FCE77A70C4498E9008E58D099775

arm64—8CBD9CA6BDBC9726A414620829E55CA328985D63DC6FFA413749E36DF880B78E

139.0.4

x86—3A3093938A30FBE216A50DA472C711C172612A4BC6E970ACB3FB0D83C2CB9E04

x64—4615366EBA64CAA89EEDAAFE68CA84305F646E0F121CDFAAF57ECC96EF93190E

arm64—740ABECCD7C08A7A992DC7421EFCE4B0F31E63D9C4D5C57245D64DEFDC931AB1

139.0.1

x86—09609D59F425502DA6537E14EE3E99F02A2CB89F26484859A3E7CFD05D7564A2

x64—C9AE5FFB7A3314485C821B7D849692835107C3E8F9854320A4C3CA826E8C2595

arm64—98D775197EB34156A7F2EA9BEFC4744230FE791028603D1560E6806B9491E8C2

139.0

x86—5400D0C81568C2B55B77A15088473B406EA6E426F31C485C5054F19AAB725A95

x64—5FEE5D9F7F2063AE6407F83413F03E687C8D155A41B6AC9D395D65212C787353

arm64—B180A41EEDE0C6B2D2883BAA7B42D1A2887347E96DE4329CC8D98FA3271E8BD2

138.0.4

x86—806EDF44C76185E9893CEEB66C439DE231183039F54D294D1B89968B036D1B3A

x64—7BD5507079FF31254E84F4326D79122501B2745517C3806D645B9FA3FC472D53

arm64—A6CE292BA5D351A2258D1EE91BC96F5CB34994F9ACF9C7093A41197FF2292E4B

138.0.3

x86—E261EFFD5FAAF69CB0158EECBCD4942D75A2B3464E28F5393482C624886099E5

x64—D2A0A3F9E7319520831617B598C0E651DABB0EBDBBBA5E75B447B2A1728A8F26

arm64—45673C9926FAF04B0AE79E3BF61E67EEAA9E53B31286DCDA735FC5435B1C2A17

138.0.1

x86—E3184645C9B19A2A3EA42517304E97D93738DE7018ACB328D58D0CD50A0F373A

x64—2797A2C3365823DCD6D58AFF81B09671F6CD50BE211849B95D53A978DB2DD85B

arm64—A71D6B9B129BFBDF1CE37F7A2988CE8CFCE90E6D62FE30CF3E00C948E05CD1F2

138.0

x86—6DCC75391BA43046CA57144FB87A1CA527E27E16ED60067FA22CC1154DDA0E2C

x64—EC45202AB798091B3F3BE79617A91BABEE784A3AF734C2EC1E486DBB7AC2FCE3

arm64—2003D6E26167E4F553302437EDDEA817AD9371707B1503F65ECA37C83FC989D0

137.0.2

x86—C344A9190F7E763442DFCB9177B275AF85950764F159C383440F2539BF61939B

x64—D6D0BC8EC4890D3959E0154266F4ED1A8288A77B5BC4DC628F3E9651DDAAD292

arm64—798799F82A16FE6A8609D08C7B94E3D5304EEE1B3A958F4E342429502BBAD571

Mozilla Firefox (is)

Latest 156.0·September 15, 2026

Installer type: nullsoft

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Installer type: `nullsoft`