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Because of its ability to communicate with the server, the object XmlHttpRequest (XHR), used in the technology Ajax (which stands for Asynchronous JavaScript and XML, which should be pronounced "egiacs" even if we Italians prefer "aiacs"), has a security lock that prevents you from running applications outside the domain in which it operates. This protection is necessary to prevent Javascript Injection (techniques of "injection" extremely dangerous code in order to break the system) of various kinds, with the ultimate objective of "break" in the system.
This limit is now taken into serious consideration and you're thinking, somehow, to solve it - XmlHttpRequest object directly - without compromising security (see also: Third Proposal for cross-site extensions to XMLHttpRequest ).

However, the situation today is as follows:

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It is available online version of Firefox 3.0 Alpha 2 , code-named Gran Paradiso. Among the features announced (the final version is expected in late 2007) we can use the browser in offline mode. All this reminds Adobe Apollo , which, despite not presenting himself as the browser, it evokes the essential features.

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