The best approach to include the CSS for multiple extensions or add-ons in your webpage, is to create a new .css file generated by SCSS.
To do so, start off by creating a new (empty) .scss file and
@import the needed .scss files.
For example, if you're using only the "navbars" and "searchfield" add-ons.
/* in custom-mmenu.scss */ @import "path/to/src/css/jquery.mmenu"; @import "path/to/src/addons/navbars/jquery.mmenu.navbars"; @import "path/to/src/addons/searchfield/jquery.mmenu.searchfield";
Now all you need to do, is run Sass from the command line.
sass path/to/custom-mmenu.scss path/to/custom-mmenu.css