Firefox doesn't start

When I try to open it, it gives me the little hourglass deal on my cursor for like half a second, then nothing.  Nada in my taskbar, reinstalled it and everything, and it still does the same thing.  What's the deal?

Now this is the story all about how
My life got flipped, turned upside down
And Id like to take a minute just sit right there
Ill tell you how I became the prince of a town called bel-air

In west philadelfia born and raised
On the playground where I spent most of my days
Chilling out, maxing, relaxing all cool
And all shooting some b-ball outside of the school
When a couple of guys said were up in no good
Started making trouble in my neighbourhood
I got in one little fight and my mom got scared
And said youre moving with your aunte and uncle in bel-air

I whistled for a cab and when it came near the
Licensplate said fresh and had a dice in the mirror
If anything I could say that this cab was rare
But I thought now forget it, yo home to bel-air

I pulled up to a house about seven or eight
And I yelled to the cabby yo, home smell you later
Looked at my kingdom I was finally there
To settle my throne as the prince of bel-air