QA pointed this out tonight, and I forgot that Verdi and I had talked about it last month. The spec says that when a tip is showing and the user clicks in the urlbar, it should be the same as if they had clicked the "okay got it" button: we shouldn't show tips anymore. I asked Verdi about that because we don't currently have a urlbar API that would let us handle that, and the intention is to acknowledge that the user has "seen" the tip and therefore we shouldn't bother them with it anymore.
We can listen for something not quite the same but that I think still follows the intention: the tip is showing and we receive an "engagement" event. i.e., the tip was visible, and then the user engaged with the urlbar. That might be even better than listening for a click because with engagement we know they actually engaged. I haven't talked to Verdi about specifically using engagement, though.