I wrote:
In article , marc writes:
[...]

With regard to my commitment to further investigate
recording internet radio, I should mention that VLC
with an external USB or non-USB audio recorder may
just solve your problem outright.

Here's what further investigation found, though:

Windows Media Center (only installed on a system
supplied by my employer) will not open the .pls file.
It states that access is "denied by policy". Perhaps
my employer does not want me listening to internet
streams, and they certainly do not want me illegally
recording them.

Real Player is listed as being able to play all
sorts of streaming formats - quite reasonable since
that was one of their original claims to fame.
In particular the can handle various playlist
formats including .pls, according to their
Wikipedia entry. I'm not going to download it
though, because I don't have an anything near
up-to-date Windows system at home.

There's always the possibility it can record.

Note that Linux has so many audio options it is
just about impossible for me to sort through to
find which have recording features. But there are
distributions that focus on multimedia and might
already have what you need installed and ready to
use.

If you do a search for "browser extensions
to record streaming audio" you'll find various
options. One of the first I ran into when
I searched for Firefox extensions was called
"Media Stealer", which, after all, is what
the original question is likely about.

At https://swen.antville.org/stories/735413/
I found this concerning VLC:

"Videolan is one of the best media player around.
It also has a feature to record a streamed file
as a mp3 file." So maybe I just did not work at it
hard enough when I tried it. Elsewhere on the
page is a recommendation for the free Audacity
product I mentioned earlier.

In general, though, it is likely the reason recording
options are somewhat difficult to find, or even
nonexistent, in the high profile media players is
that the developers do not want to be accused of
aiding and abetting with regard to copyright
violations.

George