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Notice of Non-Affiliation and Disclaimer

Portapps is not affiliated, associated, authorized, endorsed by, or in any way officially connected with Firefox™, or any of its subsidiaries or its affiliates.

The official Firefox™ website can be found at

The name Firefox™ as well as related names, marks, emblems and images are registered trademarks of their respective owners.


Firefox™ portable app made with Portapps.
A free and open-source web browser developed by The Mozilla Foundation.

Latest version 70.0.1
Internal release 30
Last updated 2019/11/03
Maintainer CrazyMax
License Mozilla Public License 2.0


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

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

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

Then run firefox-portable.exe and remove Firefox™ from your computer.


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


ESR (Extended Support Release) and Developer Edition are also available


Some modifications have been made in this version of Firefox™ through policies to ensure portability :

  • Multilingual : All languages are included in app\langs and can be enabled in config file (see below).
  • Disable updater : Firefox™ updates are turned off.
  • Don’t check default browser : Stops Firefox™ from checking if it is the default browser at startup.
  • ‘Know your rights’: Don’t show on first run.
  • WhatsNew: Don’t show WhatsNew on first run after every update.
  • Profile: Profile path is overrided to data\profile folder (see below).


Firefox™ portable can be configured through the main YAML configuration file :

  profile: default
  multiple_instances: false
  disable_telemetry: false
  disable_firefox_studies: false
  locale: en-US
  • profile : Name of the profile created in data\profile\<name> (default default)
  • multiple_instances : Allow multiple instances (default false)
  • disable_telemetry : If enabled, Firefox™ telemetry is not uploaded (default false)
  • disable_firefox_studies : If enabled, Firefox™ will never run SHIELD studies or do Heartbeat surveys. (default false)
  • locale : Locale located in app\langs can be used to change UI language without .xpi extension (default en-US).

Known issues

Here is the list of known issues with this portapp:


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