On macOS, FileZilla Pro registers itself, at installation time, as a URL handler for the protocols FTP, FTPS, FTPES (explicit FTPS), SFTP and S3.
There is no standard way to check which application is registered for a protocol. However, you can force FileZilla Pro to register itself as the handler for a protocol by following these steps:
Note: This option is only available starting from macOS 12 Monterey.
- Open FileZilla Pro.
- Go to Edit › Set as URL handler.