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Publisher’s description
What is Mozilla Firefox ESR (eo)?
Mozilla Firefox ESR (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 153.4.0, released on September 29, 2026. 49 versions are listed since January 23, 2024, each with links to its own installer files. That is about 18 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 18 a year)
Cons
- Installation needs administrator rights
In short: Mozilla Firefox ESR (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 Mozilla Firefox ESR (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:
383F5967FF265A4FB7FD6D069700669A20BCBF3B4447B9E4F751DDA243D67EA9· 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 49 versions ›49 versions over 3 years · about 18 a year
| Version | Date | Size | Files |
|---|---|---|---|
| 153.4.0Latest | September 29, 2026 | — | 64-bit EXE (NSIS)32-bit EXE (NSIS)ARM64 EXE (NSIS) |
| 153.3.0 | September 15, 2026 | — | ARM64 EXE (NSIS)64-bit EXE (NSIS)32-bit EXE (NSIS) |
| 153.2.0 | September 1, 2026 | — | 64-bit EXE (NSIS)32-bit EXE (NSIS)ARM64 EXE (NSIS) |
| 153.1.0 | August 18, 2026 | — | 64-bit EXE (NSIS)ARM64 EXE (NSIS)32-bit EXE (NSIS) |
| 153.0.0 | July 20, 2026 | — | 32-bit EXE (NSIS)ARM64 EXE (NSIS)64-bit EXE (NSIS) |
| 140.14.0 | August 18, 2026 | — | ARM64 EXE (NSIS)64-bit EXE (NSIS)32-bit EXE (NSIS) |
| 140.13.0 | July 21, 2026 | — | ARM64 EXE (NSIS)32-bit EXE (NSIS)64-bit EXE (NSIS) |
| 140.12.0 | June 16, 2026 | — | 32-bit EXE (NSIS)ARM64 EXE (NSIS)64-bit EXE (NSIS) |
Install from the command line
Silent install ›winget install --id Mozilla.Firefox.ESR.eo -e"Firefox Setup 153.4.0esr.exe" /S /PreventRebootRequired=trueRelated guide: How to use winget: install and update apps
Also for other systems
brew install --cask firefox@esrInformation
- 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
- 153.4.0
- Released
- September 29, 2026
- Added to the catalogue
- October 6, 2024
- Versions listed
- 49
- Updates / year
- 18.3
- Website
- mozilla.org
- winget ID
- Mozilla.Firefox.ESR.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 Mozilla Firefox ESR (eo) free?
Yes. Mozilla Firefox ESR (eo) is open-source software under the MPL-2.0 licence.
Is Mozilla Firefox ESR (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 Mozilla Firefox ESR (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 Mozilla Firefox ESR (eo) be installed silently?
Yes. The silent install page lists the exact command for each installer.
Does Mozilla Firefox ESR (eo) run on ARM (Windows on Arm)?
Yes, there is a native ARM64 installer.
Where can I download an older version of Mozilla Firefox ESR (eo)?
The versions page lists all 49 versions with links to their official installer files, back to January 23, 2024.
What are alternatives to Mozilla Firefox ESR (eo)?
Brave, Waterfox, LibreWolf, qutebrowser and Ablaze Floorp. The alternatives page compares them.
