EXE
WinGet
Firefox Developer Edition (ur)
Mozilla · 149.0 · x64
Before deploying, verify this file with VirusTotal ↗
Silent Commands
Install
"Firefox Setup 149.0b8.exe" /S /PreventRebootRequired=true
InstallPath
"Firefox Setup 149.0b8.exe" /S /PreventRebootRequired=true /InstallDirectoryPath="<INSTALLPATH>"
File Identity
Filename
Firefox Setup 149.0b8.exe
Signature
Status
Upload installer to verify signature
Installer Selection
WinGet Package
Package ID
Mozilla.Firefox.DeveloperEdition.ur
Version
149.0
Description
Firefox Browser Developer Edition
License
MPL-2.0
↗
Support
https://support.mozilla.org/
Installer URL
https://download-installer.cdn.mozilla.net/pub/devedition/releases/149.0b8/win64/ur/Firefox%20Setup%20149.0b8.exe
Upgrade Behavior
install(Install over existing)
Release Notes
Version 149.0beta, first offered to Beta channel users on February 25, 2026
Firefox Beta gets updated 3 times a week and as a consequence, the release notes for the Beta channel are updated continuously to reflect features that have reached sufficient maturity to benefit from community feedback and bug reports.
Warning: Features listed here may or may not make a final release of Firefox.
In addition to these release notes, you can follow ongoing development via the Firefox Trains website or our…