Nav bar goes all the way across in Firefox. Items don't stack in Firefox

Looked like this in firefox:
![gr8ladies_firefox](https://cloud.githubusercontent.com/assets/3268098/5560244/35ff5066-8d41-11e4-8422-01747defe720.png)

Now it looks like this:
![fixed_firefox_gr8ladies](https://cloud.githubusercontent.com/assets/3268098/5560247/5d912262-8d41-11e4-8324-d2c8c9f90f0c.png)