Userscript hiding boxes on LinkedIn
After I did a little playing around in a LinkedIn page's source code and I found out that LinkedIn already uses jQuery: that means you don't need to worry about checking if jQuery exists in the page because the page already has it.

Therefore, you can strip away all the jQuery injection nonsense, leaving your code looking like this;

var version = "2.1.4";

jQuery(document).on('scroll', function (event) {
    jQuery('li.card.guest').hide();
});




If you would like a review on how you did the on the vanilla JavaScript, leave a comment.