Settings: Automatic prefix URLs with HTTP(S)
Automatically adds https:// prefix to URLs while resolving the website address.
If an error occurs, it will fallback to http:// prefix.
Don't worry, this option will not edit the URL field in your password entry.
This setting can be changed on:
Tools -> Yet Another Favicon Downloader -> Automatic prefix URLs with http(s)://
For privacy reasons, this setting is disabled by default.