What is Swiftly on mac? I upgraded to Mavericks a few days ago and since then I keep getting a pop up floating search box randomly. I do not know what triggered it and I do not know where it is from. It is driving me crazy. Can anyone tell me?

I have Alfred and ShiftIt installed.
Do you have QQ Instant Messenger installed? 
On my computer, this was the cause for this strange popup window.