How to find download-URL?

[mmvk]

hi,
I am recording radio musik.
My problem is to find the download-URL.
In previous times I could find it with the firefox-add-on "Downloadhelper".
This does not work any more on my computer.
Can you help?
Best regards from
Manfred

[ActionParsnip]

The download URL of what, please?

[mmvk]

hi,
the URL of the radio station is
https://www.arionradio.com/arionlaikos/player
For the download of music I need the download-URL:
http://ice.onestreaming.com/arionlaikos
Somebody told me this URL. I do not know how to find it.
In previous times I could find it with the firefox add-on "Downloadhelper".
This does not work non my new computer.
cu
mm