Error I always encounter this when trying to fetch some data or info into another website using ajax. In IE its working but in FF its not.

It is not possible to fetch data from another domain. It is a security issue of Mozilla/Firefox. Latest browser will not allow to do this job. If it is a cross domain issue then the solution are to change the current configurations of your Mozilla/Firefox or avoid the approach you are going on and change it as the way as the request and response occurs in the same domain.