I am using remote calling from my visualforce page, and it is working fine, but for some reason, it is throwing the exception
Visualforce Remoting Exception: Unable to determine from which page the request originated Object
in another system.
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I see this same error on the Little Free Library map, but only when using Firefox (Chrome works fine). It seems likely that it's due to Firefox not sending the HTTP Referrer header when submitting the form data. You can try changing the setting.
The defaults in FF have changed since the question was posted so it may become more prevalent now.