The application deadline for the Google Summer of Code is 12 noon PDT / 19:00 UTC on April 3 (that’s tomorrow). So if you are a student and want to flip bits, not burgers this summer, then check out the list of projects (or think of your own) and apply!
Are none of the Firefox developers willing to come up with a project that they want to mentor?
Dan: one reason is because the Mozilla Corporation has an intern program, many core Firefox developers are involved in that instead. But over and above that, you’ll have to ask them :-) Mentoring is a time commitment; not everyone has time.
Gerv