False browser message from 1password

In Firefox I was using the search engine startpage.com and opened a link to microsoft.com, then the 1Password Firefox extension gave me the following message:

I did not sign in to startpage.com using my microsoft account, I don't believe you can even have an account on startpage.com. I was not signed in to the microsoft website.

1password version: 8.10.33
extension version: 2.23.3
OS: Windows 11 23H2
Browser: Firefox 126.0