GitHub Stars Latest release Total downloads Go Report


Phyrox Developer Edition portable app made with Portapps.
Run Mozilla Firefox Developer Edition as a portable app.

Latest version 126.0b9
Internal release 50
Last updated 2024/05/05
Maintainer CrazyMax
License Mozilla Public License 2.0


Download and install the latest portable setup where you want then run phyrox-developer-portable.exe.

If you have already installed Firefox Developer Edition from the original setup, move the following files :

  • %APPDATA%\Mozilla\Firefox\Profiles\*.default\* to data\profile\default

Then run phyrox-developer-portable.exe and remove Firefox Developer Edition from your computer.


For an upgrade, simply download and install the latest portable setup.


Following a trademark violation report (#5) from Mozilla, Firefox Developer Edition portable has been named Phyrox Developer Edition portable on Portapps. Nothing changes except its name.

Standard and ESR (Extended Support Release) are also available


Some modifications have been made through policies to ensure portability:

  • Disable updater : Firefox Developer Edition updates are turned off.
  • Don’t check default browser : Stops Firefox Developer Edition from checking if it is the default browser at startup.
  • Profile: Profile path is overrided to data\profile folder (see below).
  • A shortcut is created at launch to allow native notifications and removed when Firefox is closed


Phyrox Developer Edition portable can be configured through the main YAML configuration file:

  profile: default
  multiple_instances: false
  cleanup: false
  • profile : Name of the profile created in data\profile\<name> (default default)
  • multiple_instances : Allow multiple instances (default false)
  • cleanup : Cleanup leftover folders (default false)


You can use custom policies by creating data/policies.json file like this one:

  "policies": {
    "DisableFirefoxStudies": true,
    "DisableTelemetry": true

DisableAppUpdate and DontCheckDefaultBrowser are forced to true.

Known issues

There is no known issues Please let us know if you found one!


JavaScript is not enabled!

JavasScript must be enabled to allow the generation of dynamic download links.
Otherwise you can download directly from the releases page on GitHub.