i am unclear on if it's because of the adblocker (specifically i use ad nauseam which does block some JS. some.) or because of firefox. I can load it on edge every time it fails on firefox. last week, chase.com worked fine on firefox. the previous 15 months where i needed to log in, it did not.
Someone at chase isn't checking their work on firefox.
When I have to log into Chase on my computer, I do via Firefox, and it works fine. Maybe you flipped something on in about:config that's breaking it?
FWIW I use Firefox with uBlock Origin and Enhanced Tracking Protection, and use Chase's website almost weekly. No issues that I've noticed on MacOS or Windows