Stop FF from Filling Usernames
At "https://www.delta.com/login/loginPage?staticurl=" (login to delta.com) there's a user name field. When I click on it Firefox suggests the username. I don't want the username exposed this way because I use the 1Password password manager to fill in usernames.
In Settings "Logins and Passwords" it says "1Password – Password Manager controls this setting". "Ask to save logins and passwords for websites" is not checked, and "Autofil logins and passwords" is checked but the option is pale blue instead of bright blue and cannot be changed.
How can I stop FF from exposing my username?
Suggestions in a login drop down list that have a key icon in front are login suggestions that you need to remove in the Password Manager.
Suggestions in a drop down list without a key symbol are autocomplete saved form data. Suggestions without a key icon are part of autocomplete saved form data that you should be able to remove by selecting this item with the cursor Down key and pressing Delete (Mac: Shift+Delete).
It was autocomplete saved form data. That's for providing the correct answer and a link to a comprehensive description of the feature.