Protip: don’t download things in Firefox that has been X-forwarded through a slow SSH connection. Because when the downloads are finished and the little “Downloads complete” thing tries to slide into view, it takes a couple seconds for each pixel of movement in each direction, and the forwarded Firefox window itself becomes just about unusable during this time. (Yes, I had SSH compression turned on.)

Why I was even resorting to this is a story for another day.