Aha, that was it. Rated 4 out of 5 stars
So I'd posted earlier that the plugin wasn't working - the trick was right-clicking on the Add-ons bar, hitting "customize" and dragging each widget down manually. However, it doesn't add the little progress indicator to the status bar like it's supposed to.
This (the fact that the options didn't show up by default and status bar not changing) didn't happen on another system I use. I'm not sure what the difference is. The "working" one was Windows, and this one is Mac. But I wonder if the fact that I already had items in the add-on toolbar on the Mac meant that Status-4-Evar doesn't add by default (either due to a bug or intentionally so as not to reposition the other widgets).
Otherwise, works reasonably well.