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A website called "knowords" opens tabs in my browser without permission. I have asked for help on their site and they have refused to help. Isn't there a way that I can block them?
My version of Firefox:
Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.4; en-US; rv:220.127.116.11) Gecko/20101203 Firefox/3.6.13 GTB7.1