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

If you just don't want to waste your time on cross-domain issues during development and testing of your app you can use addon Force CORS for FF.

UPDATE: It seems that this addon no longer exists. But there is another option - this Chrome extension