Welcome to Firefox. Did you get a legitimate link to pay your invoice or top up your account? (Please be careful to avoid fraudulent payment requests that always go around.) If you live in the SF Bay Area, this probably is the relevant site, but if you live elsewhere, you could do a search to find the one you need: https://www.bayareafastrak.org/ If logging in or submitting a payment isn't working the way it did in the other browsers you have used, could you describe where it's going wrong in more detail?