solution :

change this :

[Desktop Entry] Type=Application Version=1.0 Encoding=UTF-8 Name=Google Chrome Comment=Google web browser based on WebKit Icon=google-chrome Exec=/compat/linux/bin/chrome Categories=Application;Network;WebBrowser; MimeType=text/html;text/xml;application/xhtml+xml;x-scheme-handler/http;x-scheme-handler/https;x-sc> StartupNotify=true

with this :

[Desktop Entry] Type=Application Version=1.0 Encoding=UTF-8 Name=Google Chrome Comment=Google web browser based on WebKit Icon=google-chrome Exec=/compat/linux/bin/chrome --user-agent="Mozilla/5.0 (X11; FreeBSD amd64; Linux x86_64)" Categories=Application;Network;WebBrowser; MimeType=text/html;text/xml;application/xhtml+xml;x-scheme-handler/http;x-scheme-handler/https;x-sc> StartupNotify=true