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While trying to help Dare make his MovieFinder page run in Firefox, I ran into an issue that can make developing AJAX applications a pain: when testing your pages, you need to host them in the same domain as your services. I explain the details of the problem and how the "XMLHttpRequest - Bypass Security" Greasemonkey user script solves it. Note: this script is meant for development only, as it gives the page access to a potentially dangerous API. The default @include is "file:///*", but feel free to restrict it even further to the path for the pages you're trying to tweak. You should never have to @include an http ur