Initial - working container.

container/customize/xfce4/panel/launcher-15/17311693981.desktop

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+[Desktop Entry]
+Name=Firefox ESR
+Comment=Browse the World Wide Web
+GenericName=Web Browser
+X-GNOME-FullName=Firefox ESR Web Browser
+Exec=/usr/lib/firefox-esr/firefox-esr %u
+Terminal=false
+X-MultipleArgs=false
+Type=Application
+Icon=firefox-esr
+Categories=Network;WebBrowser;
+MimeType=text/html;text/xml;application/xhtml+xml;application/xml;application/vnd.mozilla.xul+xml;application/rss+xml;application/rdf+xml;image/gif;image/jpeg;image/png;x-scheme-handler/http;x-scheme-handler/https;
+StartupWMClass=firefox-esr
+StartupNotify=true
+X-XFCE-Source=file:///usr/share/applications/firefox-esr.desktop

container/customize/xfce4/panel/launcher-16/17311694032.desktop

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+[Desktop Entry]
+Version=1.0
+Type=Application
+Exec=exo-open --launch TerminalEmulator
+Icon=org.xfce.terminalemulator
+StartupNotify=true
+Terminal=false
+Categories=Utility;X-XFCE;X-Xfce-Toplevel;
+OnlyShowIn=XFCE;
+X-AppStream-Ignore=True
+Name=Terminal Emulator
+Comment=Use the command line
+X-XFCE-Source=file:///usr/share/applications/xfce4-terminal-emulator.desktop

container/customize/xfce4/panel/launcher-17/17311694113.desktop

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+[Desktop Entry]
+Version=1.0
+Type=Application
+Exec=exo-open --launch FileManager %u
+Icon=org.xfce.filemanager
+StartupNotify=true
+Terminal=false
+Categories=Utility;X-XFCE;X-Xfce-Toplevel;
+OnlyShowIn=XFCE;
+X-XFCE-MimeType=inode/directory;x-scheme-handler/trash;
+X-AppStream-Ignore=True
+Name=File Manager
+Comment=Browse the file system
+X-XFCE-Source=file:///usr/share/applications/xfce4-file-manager.desktop