Suddenly the links (in e-mails, programs) are not opened anymore in the same portable Firefox (I have more than one Firefoxes).

When I click "Make Default"
https://i.imgur.com/Hfp51zn.png
I come to this page:
https://i.imgur.com/53CB83o.png
I click the browser, IE, and this is shown:
https://i.imgur.com/vfmiRm7.png
None of the browsers is the Firefox I want to be the default browser. How could I make that brwoser the default one and keep it as the default one?