We should remove the panel persistence and reordering code. It's overly complicated, not slated for v1, and it also prevents the new TopSitesPanel (bug 1135920) from being the first panel in the list. We should also remove TabsPanel while we're at it. There's not much there, and I doubt will end up keeping any significant amount of it.
Created attachment 8572992 [details] [review] Pull request