Firefox portable problem

Hi, I have problem with Portable Firefox, it is my default browser to start links but when I click on link on Viber Desktop it launches Firefox in new window with other profile which is located in Roaming profile on system disk...Now I have 2 windows of same program running 2 different profiles...How to manage this, I want to open links with my main profile, which is on usb drive? I think that some recent update of Portable Firefox make that, I run this setup normally for many years...