Creating shortcut for apps in linux (centos/ubunut)

mozilla-firefox.desktop

[Desktop Entry]
Version=1.0
Name=Firefox
Comment=Browse the World Wide Web
Icon=/opt/firefox/browser/icons/mozicon128.png
Exec=/opt/firefox/firefox %u
Terminal=false
Type=Application
Categories=Network;WebBrowser;
Actions=Default;Mozilla;ProfileManager;

[Desktop Action Default]
Name=Default Profile
Exec=/opt/firefox/firefox --no-remote -P minefield-default

[Desktop Action Mozilla]
Name=Mozilla Profile
Exec=/opt/firefox/firefox --no-remote -P minefield-mozilla

[Desktop Action ProfileManager]
Name=Profile Manager
Exec=/opt/firefox/firefox --no-remote --profile-manager