It think it requires a
php flarum cache:clear when changes are made.
Possibly not recommended for HTML only flarum instances.
I will try experimenting on freeflarum.com
Okay I enabled the extension and I see what you mean. My site is was hosed.
Here is the error that shows in the web console:
Navigated to https://forum.freeflarum.com/
18:48:10.479 (index):97 Uncaught TypeError: Cannot read property 'default' of undefined
(anonymous) @ (index):97
18:48:10.804 Navigated to https://forum.freeflarum.com/?nojs=1
CTRL F5 the site returned
I am not sure why it works fine on my site and doesnt work on yours.
CTRL - F5, my site loaded fine.