In an Incognito TOR tab, following a login at amazon.com, I logged into Twitter.
Instead of the normal screen — no login fields filled in — this time my login ID was already displayed.
Since then I’ve found no way to pull up a Twitter login screen that doesn’t have my login pre-filled in.
All Shields were on except for the one about ‘scripts.’ (I don’t know why that one wasn’t, unless it’s the default.)
Could that explain it? If not, why would this ‘recognition’ occur in a TOR tab?