How can I get rid of congratulations you have won in firefox!

Hi guys
I have a popup in Firefox that continue to flow upward 'CONGRATULATIONS YOU HAVE WON' now the popup is not an investigation. He skillfully use popup when switching between pages. The funny part is that you can not close the pop-up window. Normally I just go to my home page to get rid of it but change you a page appears.
Other information:
I use Windows 7 Ultimate
Browser Firefox version 30
Google.com homepage
Kaspersky Internet Security and antivirus version 14.0.0.4651 (g)
Please advice accordingly.
Concerning
Walkera

  1. Run Firefox in safe mode to check if one of the extensions of the origin of the problem:

  2. Malware can also cause these problems:
  3. You can also use some add-ons to block ads/popups:

Tags: Firefox

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