#afr_normal, .afr_normal, #afr-normal, .arf-normal
and this is why: in your js your selector is .arf-normal instead of afr-normal.
also on the homepage of the plugin it says this:
I have activated the plugin, now what ?
To be able to use the plugin, you should create a menu. You can use (or not) that menu in a widget.
The trick is to simply add the CSS class afr-normal to display normal size, afr-large for large text and aft-xlarge for very large text.
You can also apply this CSS technique in your PHP files or directly in your content.
aft-large needs to be afr-large
Thank you @progressed for sharing the solution!
@progressed I’m truly sorry for the delay. I was never notified when you submitted your support ticket.
I fixed the documentation and the plugin (leaving the wrong class there for backward compatibility).
Version 1.0.4 was released a couple of minutes ago.
Thank you.