Since there wasn't an "other" or "none of the above" option, I couldn't vote.
However, I use None of the Above, and my Other option is to use an Address Book with my own coding:
Say I want to join Best Buy. I write Best Buy on the Name line. The link goes on the Address line (if necessary).
The third line contains my username/email address: Say my email addy is XanaXZender; I code it as xyz/out with my true password on the next line. I have two email addresses, and two usernames so it's kinda required that I have both email addresses represented.
Because I
never write my complete email address in that book, and I don't write any of the info in my computer, nobody's gonna get in. I have Firefox set up to delete all history when I close it with just about everything else.
I may have made it seem complicated, but it's not really . . .