We’ve been pretty bad at maintaining our current Discourse theme - new issues have cropped up, and there are some which have never been fixed…
Mozilla’s visual style has also moved on a bit in the last year or so, and seems to suit the simplicity which I think a forum like this should have. This is why I propose we switch to the theme in use on staging (thx @jan, I tweaked a few tiny things):
Images are broken on staging for some reason unrelated to the theme, so you’re not quite getting the full experience.
It’s simpler (both in design and lines of CSS used), easier to maintain (because it mainly uses the in-built colour customizer which I don’t think existed when the first theme was created), and actually uses Open Sans.