When typing a question in, the Answerhub helpfully pops up a list of similar questions.
You can’t shift- or middle-click these questions to have them open in a new window, though. You have to click them and lose your place.
This is annoying if you’re tweaking the question title and find your tweaks have revealed a question that looks like it might be useful to look at.
Firefox 68.0.2 (64-bit).