Fixing Firefox Portable Multi-Instance Won't Load Profile Issue

Abstract: Learn how to fix the issue of Firefox Portable multi-instance not loading profile when Firefox is already open. This article is SEO optimized and provides a solution for Windows users.

Created: 2024-09-26 by UserComp.com Editors

Introduction

This article outlines a solution to a strange problem encountered on a Windows 11 system: three instances of Firefox Portable were running with the AllowMultipleInstances option set to true in the FirefoxPortable.ini file, but the second and third instances would not load a profile.

Context

Firefox Portable allows users to run the browser without installing it on a system. It can be carried on a USB drive or any portable media, making it ideal for users who need to access their browsing data from various computers. The AllowMultipleInstances option in the FirefoxPortable.ini file controls whether multiple instances of the browser can run simultaneously.

Issue Description

On a specific Windows 11 system, three instances of Firefox Portable were launched using the following batch script:


@echo off
start FirefoxPortable.exe -profile "Profile1"
start FirefoxPortable.exe -profile "Profile2"
start FirefoxPortable.exe -profile "Profile3"

Only the first instance was loading the designated profile. The second and third instances would open and then close immediately without displaying any error messages or loading the profile.

Solution

Editing the FirefoxPortable.ini file to change the following parameter from 1 to 0 resolved the issue:


Locked=0

With Locked set to 0, Firefox Portable instances can create and write to their own profile directory when multiple instances run.

Step-by-Step Instructions

Open the Firefox Portable directory.
Find and open the FirefoxPortable.ini file using a text editor like Notepad or Notepad++.
Search for the Locked parameter.
If the value of Locked is set to 1, change it to 0.
Save the changes in the FirefoxPortable.ini file.

The issue of Firefox Portable multi-instance will not load profile on a Windows 11 system can be resolved by editing the FirefoxPortable.ini file and changing the Locked parameter from 1 to 0. This allows multiple instances to create and write to their own profile directory.

References

Tags: Firefox Portable Multi-Instance Profile

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