I would delete your cache and cookies. If that doesn't get rid of it then I would download malwarebytes from their website and do a full scan.
If you are a paying member you get no ads or If you are using firefox download and install the noscript and adblock plus add-on's to block all advertisements and disable all java-script. You will have to tweak settings on each website in no-script to allow what access you want but once you are tuned it can be very nice not to be bombarded by ads.
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