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
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