Don't know if it's a bug or a feature request, but here I go. ;) In GNOME versions < 2.12 Epiphany's address input worked differently than it does now in 2.12. Before you could input a search phrase and it was searched using google.com, but now when you type "search me" to the address input you get an alert saying "The URL is not valid and cannot be loaded". It was nice functionality and I used it a lot, so removing is quite a painful for me. Reproducible: Always Steps to Reproduce:
Confirmed, the "Search the web: " toolbar option works though.
Upstream here: http://bugzilla.gnome.org/show_bug.cgi?id=314974 - keyword searches will be back in in 1.8.1.