Fonts garbled in Firefox on Mac

Why is type garbled on Firefox on my Mac but not in Firefox on my PC? Explorer, Chrome and Safari all work fine. http://www.workplaceviolationshotline.ca

Thanks for any help

Not seeing any “garbeling” here between Safari and Firefox. Maybe show a screenshot?

Everything ist fine here on my Mac. Chrome, Safari, Firefox…

Thanks for checking, I guess it must be my Mac