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.
Publisher’s description
What is Mozilla Firefox (MSIX)?
Mozilla Firefox (MSIX) by Mozilla is open-source Windows software in the web browsers category.
Installation and requirements
The publisher provides MSIX installers for 64-bit, ARM64 and 32-bit Windows. It needs Windows 10 1809 or newer. A silent install is possible with the installer’s documented switches.
Updates and version history
The current version is 158.0.1, released on October 20, 2026. The version history goes back to April 15, 2025: 65 releases, all linked to the official files. That is about 43 releases a year. The last update is less than a month old.
Popularity and file types
On Windows it registers 9 file types, including .pdf, .html, .xhtml, .webp and .htm. Similar programs include Brave, Waterfox and LibreWolf.
Pros / Cons
Pros
- Open source: the code can be inspected and built by anyone
- Native ARM64 build for Windows on Arm
- Documented silent install
- Frequent updates (about 43 a year)
In short: Mozilla Firefox (MSIX) is an open-source web browser tool for 64-bit, ARM64 and 32-bit PCs. It is actively maintained. Administrators can deploy it unattended.
Is Mozilla Firefox (MSIX) safe to download?
- The file is served by download-installer.cdn.mozilla.net; check that it is the publisher’s official mirror
- The download link uses HTTPS
- A SHA256 hash is published, so you can verify the file:
CBD8D3BAF5BB0C7666BF565F0EBDABD6E8C18E46D56B6BD1D11EB9ABCB649EEC· Open the VirusTotal report for this hash - The link has not been checked yet
- The source code is public
- ExeAtlas does not host, wrap or modify installers
Related guide: How to check a file’s SHA256 hash on Windows
Recent versions
All 65 versions ›65 versions over 2 years · about 43 a year
| Version | Date | Size | Files |
|---|---|---|---|
| 158.0.1Latest | October 20, 2026 | — | 32-bit MSIX64-bit MSIXARM64 MSIX |
| 158.0 | October 13, 2026 | — | 32-bit MSIX64-bit MSIXARM64 MSIX |
| 157.0.1 | October 6, 2026 | — | ARM64 MSIX64-bit MSIX32-bit MSIX |
| 157.0 | September 29, 2026 | — | 32-bit MSIX64-bit MSIXARM64 MSIX |
| 156.0.1 | September 22, 2026 | — | 32-bit MSIXARM64 MSIX64-bit MSIX |
| 156.0 | September 15, 2026 | — | 64-bit MSIX32-bit MSIXARM64 MSIX |
| 155.0.1 | September 4, 2026 | — | 64-bit MSIX32-bit MSIXARM64 MSIX |
| 155.0 | September 1, 2026 | — | 32-bit MSIX64-bit MSIXARM64 MSIX |
Release cycle and support
Version 158.0.1 belongs to the 158 release line, supported until October 27, 2026.
| Release line | Released | Support ends | Latest version | Status |
|---|---|---|---|---|
| 158 | October 13, 2026 | October 27, 2026 | 158.0.1 | Supported |
| 157 | September 29, 2026 | October 13, 2026 | 157.0.1 | End of life |
| 156 | September 15, 2026 | September 29, 2026 | 156.0.1 | End of life |
| 155 | September 1, 2026 | September 15, 2026 | 155.0.1 | End of life |
| 154 | August 18, 2026 | September 1, 2026 | 154.0.1 | End of life |
| 153 (ESR)LTS | July 21, 2026 | not announced | 153.5.1 | Supported |
| 152 | June 16, 2026 | July 21, 2026 | 152.0.6 | End of life |
| 151 | May 18, 2026 | June 16, 2026 | 151.0.4 | End of life |
Install from the command line
Silent install ›winget install --id Mozilla.Firefox.MSIX -eAdd-AppxPackage -Path "Firefox Setup 158.0.1.msix"Get-AppxPackage -Name Mozilla.MozillaFirefox | Remove-AppxPackageRelated guide: How to use winget: install and update apps
Also for other systems
brew install --cask firefoxInformation
- Publisher
- Mozilla
- Category
- Web browsers
- Licence
- MPL-2.0
- Price
- Free
- Requires
- Windows 11 / 10 (Windows 10 1809+)
- Architecture
- 64-bit, ARM64, 32-bit
- Installer
- MSIX
- Version
- 158.0.1
- Released
- October 20, 2026
- Added to the catalogue
- April 30, 2025
- Versions listed
- 65
- Updates / year
- 42.9
- Website
- mozilla.org
- winget ID
- Mozilla.Firefox.MSIX
File types it opens (9)
Ratings and reviews
No reviews yet. Be the first to rate it.
Alternatives to Mozilla Firefox (MSIX)
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Frequently asked questions
Is Mozilla Firefox (MSIX) free?
Yes. Mozilla Firefox (MSIX) is open-source software under the MPL-2.0 licence.
Is Mozilla Firefox (MSIX) safe to download?
The download comes from download-installer.cdn.mozilla.net; ExeAtlas does not host or change the file. Compare its SHA256 hash with the one shown here, or open the VirusTotal report for that hash.
How do I install Mozilla Firefox (MSIX) with winget?
Open PowerShell or Windows Terminal and run the winget command shown on this page. winget downloads the official installer and checks its SHA256 hash before running it.
Can Mozilla Firefox (MSIX) be installed silently?
Yes. The silent install page lists the exact command for each installer.
Which Windows versions does Mozilla Firefox (MSIX) support?
The installer requires Windows 10 1809 or newer and is available for 64-bit, ARM64 and 32-bit.
Does Mozilla Firefox (MSIX) run on ARM (Windows on Arm)?
Yes, there is a native ARM64 installer.
Where can I download an older version of Mozilla Firefox (MSIX)?
The versions page lists all 65 versions with links to their official installer files, back to April 15, 2025.
What are alternatives to Mozilla Firefox (MSIX)?
Brave, Waterfox, LibreWolf, qutebrowser and Safari. The alternatives page compares them.
