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At Firefox launch, why do I get this Alert: "Firefox doesn't know how to open this address, because the protocol (launch) isn't associated with any program."

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At Firefox launch, why do I get this Alert: "Firefox doesn't know how to open this address, because the protocol (launch) isn't associated with any program."

# Question At Firefox launch, why do I get this Alert: "Firefox doesn't know how to open this address, because the protocol (launch) isn't associated with any program."

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Looks like you have an application that adds launch: to the command line to start Firefox.

You can also check the Firefox shortcut to see with what command Firefox is started.