Disappearing tab--pop under

possible malware attached to speed dial I have noticed a disappearing tab that pops under, not sure what it does, but when I turn off speed dial it does not happen. It pops up every 60 seconds then disappears after about 3 seconds. I use chrome and it only shows in the settings menu as 1 tab open, but does NOT show up in the full history listing. I'm worried it is malware or keystroke logger or ??? I really like speed dial, but will look for other options other than speed dial. Or is this a bug or feature of speed dial? It also happens in Firefox.