You need to have a @require in the user script header to load jQuery. Something like:
// @require http://code.jquery.com/jquery-3.3.1.min.js
References
https://stackoverflow.com/questions/24753908/trying-to-load-jquery-into-tampermonkey-script
You need to have a @require in the user script header to load jQuery. Something like:
// @require http://code.jquery.com/jquery-3.3.1.min.js
References
https://stackoverflow.com/questions/24753908/trying-to-load-jquery-into-tampermonkey-script