Why does Firefox remember Social Security numbers?

I do not think this is normal operation, so I am unsure if this is Firefox's fault or the website's fault. I was just doing something on Paypal.com and when it came time to fill in my social security number, it had "suggestions" pop up under the fields with my SSN that it remembered before. Things like SS# and credit card numbers should not be remembered like this because it's a major security issue for if someone else uses my computer.
I do not want to disable remembering fields entirely because that feature is useful to me. Names, addresses, phone numbers, emails, is all okay to be auto-filled in, but not something as extremely sensitive as SS#'s.
Again, sorry if this is Paypal's fault. I will be contacting them instead if it is.
Thank you for any information you can provide.

SSN's might get stored as part of '''form history''' and not recognized as such, depending upon how the Field Name of the on-page form is labeled. Clear your '''Form and Search History''' or don't save that data to begin with.
https://support.mozilla.org/en-US/kb/remove-recent-browsing-search-and-download-history
Or get in the habit of opening a New Private Window when confronted with the need to insert SSN's which might get saved in Form History.

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