Can't get Firefox Portable to load websites properly... I've tried everything. :[

pretty much the title...

Firefox Portable in of itself runs perfectly fine on my laptop, but when I launch it from a third party app (an Antidetect Browser) it only half-loads most pages, there's missing fields and everything is all scrambled

for example, I can't check out on my Amazon account and when I went to purchase a gift card from Uber Eats earlier today, the email field was missing

any help would be appreciated!

I've tried just about everything