ooo.... looks to me the first time something firefox did first and chrome copied it. usually its the other way around with firefox bastardizing chrome features just to appease "it had to be done"
Pretty much every Chrome feature is a rip-off from Firefox, IE, or Netscape before so there's that.
The combined address/search bar was presented by Chrome first iirc. Maybe IE was earlier? I cannot remember, never used it (first Netscape, then Mozilla, then Phoenix/Firebird/Firefox).