Firefox’s Reader View seems to me to show a font that is similar to Helvetica. If I try to make it use only Inter, Arial, or “sans-serif”, then it changes the font. What font is Firefox using instead? This also happens in Firefox forks.

  • I don’t know the answer, but the devtools inspector should work in that view too, I think. If you use it’s tool that selects the element on which you have clicked, you should see the list of fonts in order of preference on the right, which is the CSS viewer. To check which one it is, you could remove fonts from the list one by one