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 (eo)?
Firefox Developer Edition (eo) is an open-source web browser program for Windows from Mozilla.
Installation and requirements
Official installers exist for 64-bit, ARM64 and 32-bit as EXE (NSIS). Installation asks for administrator rights. The installer supports unattended (silent) installation.
Updates and version history
The current version is 151.0, released on May 13, 2026. 19 versions are listed since October 18, 2024, each with links to its own installer files. That is about 12 releases a year.
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 12 a year)
Cons
- Installation needs administrator rights
In short: Firefox Developer Edition (eo) 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 Firefox Developer Edition (eo) 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:
DDED616FDBEA770E40CF31C921490108E49E242BC4A74A09ECC60874E335DF8D· 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 19 versions ›19 versions over 2 years · about 12 a year
| Version | Date | Size | Files |
|---|---|---|---|
| 151.0Latest | May 13, 2026 | — | 32-bit EXE (NSIS)64-bit EXE (NSIS)ARM64 EXE (NSIS) |
| 149.0 | March 13, 2026 | — | 64-bit EXE (NSIS)ARM64 EXE (NSIS)32-bit EXE (NSIS) |
| 148.0 | February 8, 2026 | — | 32-bit EXE (NSIS)ARM64 EXE (NSIS)64-bit EXE (NSIS) |
| 147.0 | December 22, 2025 | — | 64-bit EXE (NSIS)32-bit EXE (NSIS)ARM64 EXE (NSIS) |
| 146.0 | November 28, 2025 | — | ARM64 EXE (NSIS)64-bit EXE (NSIS)32-bit EXE (NSIS) |
| 145.0 | October 31, 2025 | — | ARM64 EXE (NSIS)32-bit EXE (NSIS)64-bit EXE (NSIS) |
| 144.0 | October 3, 2025 | — | 64-bit EXE (NSIS)ARM64 EXE (NSIS)32-bit EXE (NSIS) |
| 143.0 | September 5, 2025 | — | ARM64 EXE (NSIS)32-bit EXE (NSIS)64-bit EXE (NSIS) |
Install from the command line
Silent install ›winget install --id Mozilla.Firefox.DeveloperEdition.eo -e"Firefox Setup 151.0b10.exe" /S /PreventRebootRequired=trueRelated guide: How to use winget: install and update apps
Also for other systems
brew install --cask firefox@developer-editionInformation
- Publisher
- Mozilla
- Category
- Web browsers
- Licence
- MPL-2.0
- Price
- Free
- Requires
- Windows 11 / 10
- Architecture
- 64-bit, ARM64, 32-bit
- Installer
- EXE (NSIS)
- Version
- 151.0
- Released
- May 13, 2026
- Added to the catalogue
- October 8, 2024
- Versions listed
- 19
- Updates / year
- 12.1
- Website
- mozilla.org
- winget ID
- Mozilla.Firefox.DeveloperEdition.eo
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 (eo) free?
Yes. Firefox Developer Edition (eo) is open-source software under the MPL-2.0 licence.
Is Firefox Developer Edition (eo) 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 Firefox Developer Edition (eo) 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 (eo) be installed silently?
Yes. The silent install page lists the exact command for each installer.
Does Firefox Developer Edition (eo) run on ARM (Windows on Arm)?
Yes, there is a native ARM64 installer.
Where can I download an older version of Firefox Developer Edition (eo)?
The versions page lists all 19 versions with links to their official installer files, back to October 18, 2024.
What are alternatives to Firefox Developer Edition (eo)?
Brave, Waterfox, LibreWolf, qutebrowser and Ablaze Floorp. The alternatives page compares them.
