Open a Web Inspector Window then zoom in and out using full page zoom. In DOM view, the text in the view doesn't zoom, but the triangle image does (and is clearly low res). Also, there are several cosmetic problems with the interface in general, and resizing any of the side bars suggests that it doesn't know their correct location. Example screenshots coming. Not sure if bug14588 is relevant
Created attachment 19980 [details] Web Inspector zoomed in
Created attachment 19981 [details] web Inspector zoomed out
I note now that if you try to use full page zoom on separate web inspector windows, that it just beeps, so I presume that full page zoom is now deliberately prevented on these windows, so am closing as INVALID