jensclas wrote:
It could be one of many things but often the candidate is your theme. Test this out by using the 'default' theme in both browsers. If that works then it is a the theme you are using that will need some fixing. If you want help to fix it post your website here so Theme helpers can take a look for you.
A search in FAQ found this and this
but i am not certain they will be specific to your problem without more information from you.