The Firefox release channel below Beta and above Nightly. Get the latest features, fast performance, and the development tools you need to build for the open web using Firefox Browser Developer Edition.
Publisher’s description
What is Firefox Developer Edition (MSIX)?
Firefox Developer Edition (MSIX) by Mozilla Corporation 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 160.0.1.0, released on October 26, 2026. The version history goes back to February 13, 2026: 12 releases, all linked to the official files. 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 qutebrowser.
Pros / Cons
Pros
- Open source: the code can be inspected and built by anyone
- Native ARM64 build for Windows on Arm
- Documented silent install
- Updated in the last two months
In short: Firefox Developer Edition (MSIX) is an open-source web browser tool for 64-bit, ARM64 and 32-bit PCs. Administrators can deploy it unattended.
Is Firefox Developer Edition (MSIX) safe to download?
- The file is served by archive.mozilla.org, the publisher’s own domain
- The download link uses HTTPS
- A SHA256 hash is published, so you can verify the file:
8E3AA56B63AE564CE87E7480EEE8CB8C8C2486E2B367E8A860342C4ECAC51741· 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 12 versions ›| Version | Date | Size | Files |
|---|---|---|---|
| 160.0.1.0Latest | October 26, 2026 | — | ARM64 MSIX64-bit MSIX32-bit MSIX |
| 159.0.5.0 | October 21, 2026 | 193.8 MB | ARM64 MSIX64-bit MSIX32-bit MSIX |
| 159.0.4.0 | October 19, 2026 | — | 32-bit MSIX64-bit MSIXARM64 MSIX |
| 159.0.3.0 | October 16, 2026 | — | 64-bit MSIX32-bit MSIXARM64 MSIX |
| 159.0.2.0 | October 14, 2026 | — | 64-bit MSIX32-bit MSIXARM64 MSIX |
| 159.0.1.0 | October 12, 2026 | — | 64-bit MSIX32-bit MSIXARM64 MSIX |
| 158.0.5.0 | October 7, 2026 | — | ARM64 MSIX64-bit MSIX32-bit MSIX |
| 158.0.4.0 | October 5, 2026 | — | ARM64 MSIX64-bit MSIX32-bit MSIX |
Install from the command line
Silent install ›winget install --id Mozilla.Firefox.DeveloperEdition.MSIX -eAdd-AppxPackage -Path "Firefox Setup 160.0b1.msix"Get-AppxPackage -Name Mozilla.MozillaFirefoxDevedition | Remove-AppxPackageRelated guide: How to use winget: install and update apps
Also for other systems
brew install --cask firefox@developer-editionInformation
- Publisher
- Mozilla Corporation
- 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
- 160.0.1.0
- Released
- October 26, 2026
- Added to the catalogue
- February 19, 2026
- Versions listed
- 12
- Website
- mozilla.org
- winget ID
- Mozilla.Firefox.DeveloperEdition.MSIX
File types it opens (9)
Ratings and reviews
No reviews yet. Be the first to rate it.
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Frequently asked questions
Is Firefox Developer Edition (MSIX) free?
Yes. Firefox Developer Edition (MSIX) is open-source software under the MPL-2.0 licence.
Is Firefox Developer Edition (MSIX) safe to download?
The download comes from archive.mozilla.org, which belongs to the publisher; 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 Firefox Developer Edition (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 Firefox Developer Edition (MSIX) be installed silently?
Yes. The silent install page lists the exact command for each installer.
Which Windows versions does Firefox Developer Edition (MSIX) support?
The installer requires Windows 10 1809 or newer and is available for 64-bit, ARM64 and 32-bit.
Does Firefox Developer Edition (MSIX) run on ARM (Windows on Arm)?
Yes, there is a native ARM64 installer.
Where can I download an older version of Firefox Developer Edition (MSIX)?
The versions page lists all 12 versions with links to their official installer files, back to February 13, 2026.
What are alternatives to Firefox Developer Edition (MSIX)?
Brave, Waterfox, qutebrowser, LibreWolf and Safari. The alternatives page compares them.
