When FTP websites connections are set up in FileZilla connection manager, it is possible to retrieve the password, along other connections information, and even pass it to an other FileZilla installation.
Going from the list of FTP connections setup
If you want to get to the information available in the connection manager, including password
There, a file sitemanager.xml will be present
This file contains all connections information for all the FTP connections setup – simply copy and paste the file if you install FileZilla on another computer and want to reuse the connections
In order to retrieve the password, use for example https://www.base64decode.org/ as below – you can also use it to encrypt a new password and paste it directly in the sitemanager.xml file