For getting webstorm fully install as a regular ubuntu app, and don't have to launch it with the script ./webstorm.sh add these webstorm.desktop in your /usr/share/applications/. Don't forget to replace WEBSTORM_PATH by your webstorm absolute path
[Desktop Entry]
Type=Application
Name=JetBrains WebStorm
Exec=WEBSTORM_PATH/bin/webstorm.sh %f
Icon=WEBSTORM_PATH/bin/webide.png