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.
CDNs like Cloudflare will often block traffic if you don't leak enough data to differentiate yourself from a bot. It's usually not very transparent either, with vague error messages. They've given up on just throwing up a captcha then letting you proceed, because bots are much better than real people, at solving them.
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
Someone at chase isn't checking their work on firefox.