CSS Font Error

Firefox Development
#1

I hope this is the right place to ask.

I have the following CSS declaration:

font-family: 'Alex Brush', 'Lucida Handwriting', cursive;

When I open the console, there is this error:

Request for font "Lucida Handwriting" blocked at visibility level 2 (requires 3)

What does the error mean? Where can I find documentation on visibility levels? The error only happens in Firefox.

#2

There are various pages with explanations on the web. Here is one: https://askubuntu.com/questions/1508419/firefox-is-displaying-wrong-font-for-particular-web-site