Firefox question - can I open a URL in a 'hidden' tab, or at least not move to the tab when opening it?

[Chris Green]

Is there any way in Firefox to 'open' a URL but not move to a tab to
display it?

I want to open internet radio URLs without changing what Firefox
shows, so either some sort of hidden TAB or simply a way of not going
to tabs opening certain specific URLs would do what I want.

-- 
Chris Green