Guys, this is very old. I think it come out with 2.0 beta or some time like that, maybe even 1.5 it set that as the home page on fresh profiles or installs with new profiles. It was considered neat back then, but that's before all the anti google stuff started. You know back when they could do no wrong. LOL
The stuff at the top when you are logged in is somewhat newer, but that is attached to anything you may be signed in for with google. For me it's gmail that it does that with. I'm pretty sure there is a way to op-out of that but I can't remember how. Never really tried myself. Google started that when they started merging all their services.. like the office stuff and the webhosting and so on. For me it doesn't just have that at the top of the Firefox google page but at the regular google search page as well.