Solve : popunders?

1.	Solve : popunders?
Answer» Hi, I have a two part question: I have a compaq laptop with vista, firefox and AVAST. I am bothered by popunders that firefox lets through. I've tried blocking the site by going to tools, options, block and then I paste the address of the popunders (netflix and a credit COMPANY) it is cdn.optmd.com/. My QUESTIONS are 1) why doesn't this work and what would work? and 2) why does my list of SITES to be blocked disappear when I turn off my computer? ThanksTry the adblock PLUS add-on for Firefox and see if that helps.

Discussion