Apple Releases Safari 7.0.3 ⇥ macrumors.com
Among the contents of this update, I spotted solid gold:
Fixes an issue that could cause the search and address field to load a webpage or send a search term before the return key is pressed.
I filed this as a bug on December 3, 2012; it was closed as a duplicate. For the past year and a half, I have spent significant time fighting with my address bar. In my limited time testing this, I believe this has been fully patched. I cannot describe how relieved I am that this has been fixed.
Update: In a day of use, this issue has been largely resolved, but I’ve seen the occasional premature activation still.