Firefox setting to enable cross domain Ajax request

Question

I need to temporally allow cross domain XMLHttpRequest. Changing firefox security setting seems to be the way to go. But I\'ve tried with this and this but they did

Answer 1

I'm facing this from file://. I'd like to send queries to two servers from a local HTML file (a testbed).

This particular case should not be any safety concern, but only Safari allows this.

Here is the best discussion I've found of the issue.