why does every website now pop up with a survey page?

pretty well evey site I go to now pops up with a new window and an annoying survey! going through the troubleshooting info for firefox, it appears they are being sent from firefox. this has only started in the last couple of months. adblock doesn't stop it ....nor does my origional pop up blocker! please tell me how to stop this....its the only thing ruining the firefox experience

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