By default, OMGF parses a page's HTML document upon pageload and copies any Google Fonts it finds to your server. OMGF (Pro)'s detection settings allow you to tweak this behavior further.
Advanced Processing (only available in OMGF Pro — default: all on)
You can fine-tune OMGF Pro’s font detection by skipping certain sections of your page source. Only tweak this settings if you’re absolutely certain you don’t need it.