Not possible to remove cookies for "May always use cookies" websites

Hi,

  • go to settings → data protection and security (“Datenschutz und Sicherheit”) → “Cookies und andere Website-Daten” → check “Websites that may always use cookies”
  • I have three entries shown here:
    https://[*.]firebaseapp.com
    https://accounts.google.com
    somafm.com

I can edit them, but settings are not accepted. It’s not possible to delete these entries.

What’s the reason these may not be removed etc.?