..this is -kind-of- a bug report. FreeBSD basic install, old dell laptop, firefox. the https://xkcd.com/955/ tab won't close when it's selected. I have to select a different tab, then click the x on the xkcd tab. There was one point when the whole thing went hay-wire as if I was rapidly clicking the tab to try to close it, and it was just repeatedly re-opening. ..strange, since starting to write this post, the behavior seems to have vanished.. there was something that caused it to open up new tabs of the same site when I did something else..