This browser compatibility gap is a crucial point - without Firefox support, these APIs can't be considered production-ready for sites that need cross-browser consistency, undermining the article's central argument.

yeah, if it's not in firefox it doesn't count.

https://bugzilla.mozilla.org/show_bug.cgi?id=1823896

also mobile safari so basically all iphones.

For me, this is the key takeaway from the article, leveraging experimental browser extensions for preloading future pages. In other words, exactly what a properly thought-out SPA does.