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today I started getting pop ups while surfing the web. Never had this before. Also I noticed several words on craigslist ads are different colored.

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When I open firefox i am getting a new small browser window opening with some kind of ad (different ad each time). McAfee blocks the ad after about 10 - 15 seconds. I also noticed that while looking at ads on craigslist, a few of the words are different colors and they take you to another website when clicked on. How do I get rid of this problem?

This just started today

When I open firefox i am getting a new small browser window opening with some kind of ad (different ad each time). McAfee blocks the ad after about 10 - 15 seconds. I also noticed that while looking at ads on craigslist, a few of the words are different colors and they take you to another website when clicked on. How do I get rid of this problem? This just started today

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Have you got Firefox set to block popups? Look in Options > Content and see if anything is whitelisted in the exceptions. You can block most of the advertising stuff if you use Adblock Plus with an Easylist subscription. There is also an auxiliary addon for Adblock Plus to block more popups. There is a site textsrv.com that adds links to sites to redirect to other sites that you can block with Adblock Plus (if it is not already blocked) by adding that to the custom block list.