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.
What to do if there is a bug:
Try to find whether someone else has already experienced the same bug - using bug trackers, such as bugs.jquery.com/newticket
Make sure that you use the latest version or build of a browser
Create a reduced test case
Reducing = isolate the problem so you can figure out the actual problem, without getting distracted by the other code around it
If problem recurs on the repeat, it means you've successfully isolated the code where the problem occurs.
Then continue to remove code, and see whether it still creates a problem with IE.
Once the iterations have led you to clearly identify the problem, submit the bug to the Bugtracker.