The "block web fonts" feature not working

Expected behavior

block web fonts do not work in the Firefox app focus.biasa when we enable web block fonts then all fonts will be blocked on the web page that we open.

Actual behavior

I opened the firefox focus application to search the web address after opening it I want to block fonts on the site but the web block fonts in the Firefox focus app does not work.

How to reproduce

• Download Firefox focus in play store.

• open the Firefox application focus select the settings feature and click the icon in the web block fonts.

• Browser: Firefox focus versi 4.2

• Operating system: android 7.1.2

• Xiaomi 4X

Recording Of The Bug