I'm not sure about FF internals, but if you want to stop the tracker bits from being sent, doing in the URL bar might be after the link gets sent to the server,

I'm not sure about FF internals, but if you want to stop the tracker bits from being sent, doing in the URL bar might be after the link gets sent to the server, in which case they still get the tracking info. So you need to rewrite it before it gets clicked.