How do I remove a nuisance pop-up?

I keep getting pop-up fir xfinity on line services whenever I access a browser. I do not use Xfinity (Comcast), nor do I wish to use it. I don't know how it got into my browser, but I sure would like to get it out of my browser. How do I do this-I tried blocking the page, but it did not work.

Thanks for any help you can give me.

MacBook Pro, OS X Yosemite (10.10.3), MacBook Pro Mid 2012 13 Inch

Posted on Feb 17, 2017 6:21 AM

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How do I remove a nuisance pop-up?

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