Regarding Firefox 12.0:
How does one disable the new search page when you open a new tab?
Or when you go to a dead link on a particular website a new webpage then displays after that saying something went wrong? It's a bit of a hassle when you click on the back button, because you're fighting with Mozilla as to returning to the page prior to the deadlink. I also want that to stop.

Never had these features in 11.0.