uncaught exception: Permission denied to call method XMLHttpRequest.open

Problem: I was trying to view some info that are coming from a site which embaded in another site and viewing in a third site. (sth like widget). In IE and safary it is showing but in Mozilla and Opera it is not.

Solution: It is a security issue of browser. Latest browser will not allow to do this job. If it is a cross domain issue then the only solution is to avoid the approach you are going on and change it as the way as the request and response occurs in the same domain.