Error "Server not Found" in FF

please, could someone tell me if the ‘Server not found’ error that detects when a request fails (eg. when connection is lost) may be traced uniquely through the JS code? for example, if it corresponds to that error some specific value retrievable and identifiable by means of the code.

the only idea I have is to play on specific strings in the document, such as the “Try again” button, its ID etc.

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