Firefox doesn’t support WebUSB, Web Bluetooth and several other integrations, so applications that need to connect to other devices need some kind of Chrome application.

If those features in the browser were needed, I could be a little less infuriated (they didn’t have to break previously working features, though).

However, Chrome was needed only to sign up and log in. Once that was done, I was able to disable chrome, and the app continued to work after restarting it.

Why they couldn’t implement a log in directly in the app, or use the device webview api, is beyond me.