There's only like one notable website I've had to use chromium for instead of Firefox.
The website for recalibrating a Google Pixel's fingerprint sensor. I've had to use that website twice, and I just used Microsoft Edge to do it since I can't uninstall it.
Worth noting that the calibration is for when you replace your phone screen, because often the phone screen comes with a new fingerprint scanner and for some reason the phone won't recognize it without a firmware update.
IDK what pixel you have, but iirc some of them are just known for having kinda shitty scanners. I have a pixel six with a glass screen protector and I often have to try more than once.