hahaha ! @CrocoDillon thank you for your interest in my hair.
I know that frustration. Anyway yes, jQuery is just a JS library to make things like selecting and manipulating DOM objects, animations, AJAX, events a lot easier and cross-browser. For HTML5 jQuery won’t help you much (maybe with selecting a canvas or using XHR requests).
Firefox has their own OS as well, which you can author apps for in web-based languages. Chrome has extensions, which are practically applications. And the list keeps going on and on. If you want to get to the point where you can build apps for these environments, build a bunch of websites. You’ll use all the same skills.