When I did a site that didn't play nice with one of my various Mozilla Gecko/Fusion browser flavors, I try a different one.

When they all are failing, not just WaterFox, I either fire up DuckDuckGo Browser or Safari if on a Mac.

If that were to fail I probably would quit using that service.

My actual Google account isn't allowed on most of my computers anymore, since I DeGoogled, and only have it operating in very sandboxed environments like one Vivaldi browser that lives inside of a VM.