Ads

Suddenly I'm seeing an ad above the tile of this blog.  I'm also getting those annoying link ads throughout the text of my latest post.  I did not activate or authorize any of this.  Does anyone have any idea what's happening?  Did Blogger start doing this and I missed it?

Any thoughts are appreciated.

EDITED TO ADD:

Never mind.  Some stupid Deal Caddy extension got installed in my browser.  I have deleted it and the problem is gone.