How to clear browser cache

I want to "remove" some fonts added via a CSS property @font-face

to my browser (firefox or chromium).

I know what font it is because I can see that it is being used in the Inspector Dev Tools and I am assuming it is in the font cache because it is not loaded (there is nothing in the Developer Tools tab).

The goal is to see which font files are requested by the library, but once the fonts are already installed, I cannot see them.