How can I see all the available icons often found in CSS snippets as "chrome://something/something else/etc..." ?

Hello,

basically title.

I often found such icons in CSS snippets, but never truly understood where I could see them all and now that I'm trying to do stuff with icons for my style I would truly benefit understanding how to find all these icons and how I could properly use them.

Thanks in advance to anyone who will try to help me :D