exams, testing Firefox 3.6.4, programming a Sudoku

Much is going on lately since I'm very busy studying for exams, attempting to write a Sudoku and testing the new minor update to Firefox: 3.6.4 code-named Lorentz. I am bit disappointed cause of how things are going. Lorentz has a JS speed penalty, I am having an error in an if condition and I am not doing good at exams.