Run your browser in safe mode and they should go away, then you have to work out what you added that caused the problem and remove it. Spybot or Malwarebytes will probably find it.
This problem was seen before, and in that case, the issue was:
Quote:
Originally Posted by Podonis
The browser is Google Chrome and the add-on was Vid-Streamer or something like that. It was supposed to let you download any video you were streaming to your computer. Can't remember where it came from though...