Close FileZilla completely and reopen it. The toolbars and window frames should now be dark.
Until v4.0 drops, the methods above are the state-of-the-art. If you cannot wait, consider switching to an alternative FTP client that supports dark mode natively (e.g., with the Dark theme, Cyberduck , or ForkLift ). filezilla dark theme upd
: Recent updates for macOS implement dark mode automatically based on system settings. On Linux (like Mint), FileZilla often follows GTK themes, though users have reported occasional issues after version updates. Close FileZilla completely and reopen it
Seconds later, the prompt appeared: Restart FileZilla to complete installation. with the Dark theme
On Linux, you can force a dark GTK theme (e.g., Adwaita-dark) for FileZilla via: