XMLHttpRequest.mozBackgroundRequest

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Note: This method is not available from Web content. It requires elevated privileges to access.

XMLHttpRequest.mozBackgroundRequest is a Boolean, indicating if the object represents a background service request. If true, no load group is associated with the request, with security dialogs prevented from being shown to the user.

In cases in where a security dialog (such as authentication or a bad certificate notification) would normally be shown, this request fails instead.

Note: This property must be set before calling open().

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https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest/mozBackgroundRequest