[tug0fwar]

Very true, and I agree there are programs to retrieve browser passwords [1]. Does this mean there is built-in code in Firefox which sniffs for browser-stored password files inside home directory of a user? I don't see any other way how Firefox knew that I had the logins saved in Chromium for the particular site I mentioned.

[1] https://www.nirsoft.net/utils/web_browser_password.html

[db48x]

It doesn't have to "sniff" for anything; Chrome's user profiles are stored in a well-known location. Firefox's user profiles are as well. All it has to do is check to see if any Chrome user profiles exist.