An entire fake brand of projects. What can be learned from having a lot of projects on the go?
(Moxboxx is a playlist service that supports creating playlists of YouTube, Soundcloud and Vimeo with autoplay.)
When you make stuff, makes lots of stuff. Make code to be interested in code. Hack on a lot of side projects. Don't worry if they fail. Find out what your interests are from your projects. Focus on repeating elements and try slightly different techniques.
Open source is good!
Get others to look at your code and help out. Nobody is perfect, neither is their code.
Consider submitting your apps to Firefox Marketplace.