Wrong folder for preferences
|settings path folder preferences options
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|Operating system version:
FileZilla stores it's settings in a hidden folder called ".filezilla" directly in the user folder.
On OSX there is a special folder called "~/Library/Preferences" for user defined preferences. And the "Application Support" is for all the things that are needed by FileZilla to work.
To make backups, etc. more easy FileZilla should use this places for storing it's data.