I seem to a bit slow on the uptake, but it finally hit me after repeatedly rebuilding my vSphere lab recently that some tabs are not appearing when the vCenter Server Appliance is being configured using my Firefox browser.
Specifically, this time I was trying to change my Active Directory authentication settings for lab domain migration.
Curious, I logged in using Windows Explorer and Voila! Those pesky missing tabs appeared. THREE of them, in fact. The Authentication, Services and Storage tabs.
So checking the vSphere 5.1.0b Release Notes, this is actually a known issue. Moral of the story, when configuring the vCenter Server Appliance, you probably want to use IE or any other supported browsers. Running Firefox v14 and below? Why are you even doing that? :p