Gatsby site looks and functions very differently on Firefox than other browsers - JavaScript is disabled?

Question

After having deployed my gatsby website with netlify, I realised that while it seems to work perfectly on other browsers, JavaScript seems to be disabled for the site on Firefox and google fonts does not seem to have worked as well. Anyone know why this could be? Highly appreciate any help! Site for Reference

Answer 1

I had a regex with a lookbehind, so firefox disabled my JavaScript.