Using Portable Firefox to Open External Links

Hello. Am new to using Firefox Portable and I have a question (of course).

I want to get Firefox Portable to open links when I click them from M$ Outlook. Even the option to pick which browser, when I click a link in Outlook would be okay.

I tried a freebie called Browser Tamer, but there are no instructions or examples on how to get it to work. I tried different method with it, but either the installed Firefox still opens, or I cause errors opening links.

As it is right now, even when I am using Firefox Portable, my default browser will open instead.

Wanted to come here and ask other (active to these boards) users of the program and see if anyone has any tips I can try.

Thank you.